Abstract The paper focuses on assessment of the sensitivity of investment on cash flow (ICFS) made by listed companies in Poland. Achieving this goal will also involve analysing and drawing conclusions about the balance-sheet channel of monetary transmission. An empirical part uses data from financial statements for Poland derived from Emerging Markets Information Services (EMIS), related to companies listed on the Warsaw Stock Exchange and NewConnect. Estimations were made using the Ordinary Least Squares method with robust standard errors, and results made it clear that cash flow has a positive significant impact, indicating that most companies operate on the imperfect and incomplete market, and with constrained or costly access to external financing. Further, it is found that the impact is significantly strong in the slowdown, as financial constraints are more binding. These results seem to confirm that the balance-sheet channel of monetary transmission is operative in Poland.
{"title":"Cash flow sensitivity of investment: Evidence from the Polish listed companies","authors":"Marian Nehrebecki","doi":"10.2478/ceej-2020-0009","DOIUrl":"https://doi.org/10.2478/ceej-2020-0009","url":null,"abstract":"Abstract The paper focuses on assessment of the sensitivity of investment on cash flow (ICFS) made by listed companies in Poland. Achieving this goal will also involve analysing and drawing conclusions about the balance-sheet channel of monetary transmission. An empirical part uses data from financial statements for Poland derived from Emerging Markets Information Services (EMIS), related to companies listed on the Warsaw Stock Exchange and NewConnect. Estimations were made using the Ordinary Least Squares method with robust standard errors, and results made it clear that cash flow has a positive significant impact, indicating that most companies operate on the imperfect and incomplete market, and with constrained or costly access to external financing. Further, it is found that the impact is significantly strong in the slowdown, as financial constraints are more binding. These results seem to confirm that the balance-sheet channel of monetary transmission is operative in Poland.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"35 1","pages":"157 - 171"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79879248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The transition of the Polish economy has brought about profound changes in the nature of contracts between employees and employers. These changes have been affected by the process of globalisation and dynamic technological progress. In particular, the characteristics of the contracts and the work itself have changed, which has affected the utility derived from employment by employees. The article attempts to identify the factors providing job satisfaction using the example of railway service employees. In particular, factors such as the position held, levels of tension and stress at work, level of autonomy, opportunities for personal development, the level of accordance between employees’ skills and job requirements, convenient working hours, length of vacation and the level of social respect enjoyed are important. In the study, an innovative discrete choice experiment method and econometric analysis were used to make a comprehensive examination of the factors providing satisfaction to transport service employees. Conclusions from the study indicate that although remuneration is an important element influencing job satisfaction, other non-wage factors also affect the satisfaction. The most important factors include managerial position, opportunities for personal development and the level of social respect related to the given occupation/position.
{"title":"Working Conditions and Satisfaction of Transport Service Employees","authors":"E. Wawer","doi":"10.2478/ceej-2020-0019","DOIUrl":"https://doi.org/10.2478/ceej-2020-0019","url":null,"abstract":"Abstract The transition of the Polish economy has brought about profound changes in the nature of contracts between employees and employers. These changes have been affected by the process of globalisation and dynamic technological progress. In particular, the characteristics of the contracts and the work itself have changed, which has affected the utility derived from employment by employees. The article attempts to identify the factors providing job satisfaction using the example of railway service employees. In particular, factors such as the position held, levels of tension and stress at work, level of autonomy, opportunities for personal development, the level of accordance between employees’ skills and job requirements, convenient working hours, length of vacation and the level of social respect enjoyed are important. In the study, an innovative discrete choice experiment method and econometric analysis were used to make a comprehensive examination of the factors providing satisfaction to transport service employees. Conclusions from the study indicate that although remuneration is an important element influencing job satisfaction, other non-wage factors also affect the satisfaction. The most important factors include managerial position, opportunities for personal development and the level of social respect related to the given occupation/position.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"2 1","pages":"172 - 185"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78378116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract This paper investigates whether municipalities in Poland use their municipal companies to increase debt capacity beyond the limitations imposed by the fiscal debt rules. The article presents corporate governance and agency problems on the example of relations between local government units and affiliated companies. We review and link literature on corporate finance, in particular capital structure, and public finance - debt liabilities of municipalities. We analyse a sample of 2,019 observations of municipalities and their municipal companies using the Ordinary Least Squares (OLS) method, where explanatory variables were taken from the public and corporate finance (leverage and its determinants). Results show that long-term debt of municipalities is positively associated with the leverage and size of municipal companies, but it is negatively related to their profitability.
{"title":"Do local governments use municipal companies for off-balance-sheet financing?","authors":"Weronika Stobieniecka, Anna Białek-Jaworska","doi":"10.2478/ceej-2020-0014","DOIUrl":"https://doi.org/10.2478/ceej-2020-0014","url":null,"abstract":"Abstract This paper investigates whether municipalities in Poland use their municipal companies to increase debt capacity beyond the limitations imposed by the fiscal debt rules. The article presents corporate governance and agency problems on the example of relations between local government units and affiliated companies. We review and link literature on corporate finance, in particular capital structure, and public finance - debt liabilities of municipalities. We analyse a sample of 2,019 observations of municipalities and their municipal companies using the Ordinary Least Squares (OLS) method, where explanatory variables were taken from the public and corporate finance (leverage and its determinants). Results show that long-term debt of municipalities is positively associated with the leverage and size of municipal companies, but it is negatively related to their profitability.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"29 1","pages":"242 - 257"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83603019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The paper aims to find the relationship between corporate expenditures on R&D and tax burdens comparing German with French R&D incentives. We use the OLS method for the financial and patent cross-sectional data retrieved from the Amadeus database. The results confirm that firms with higher tax spread (the difference between the nominal and effective tax rates) spend less on R&D. These are in line with findings of a positive relationship between corporate R&D investment and tax burdens. Thus, firms that invest in R&D more pay higher taxes. However, they are less profitable as the return on R&D investment is visible only in the long run. German corporate expenditures on R&D are significantly sensitive to internal funds (proxied by cash flow) and depend on debt, contrary to French. The results indicate that the French firm's age (a phase of life cycle) has a significant impact on spending on R&D compared to German. Whereas in both countries, corporate expenditures on R&D are sensitive to the number of obtained patents. The capability of reducing the level of tax burdens below the nominal tax rate in the case of older German firms stimulates them to increase their R&D expenditures. However, German firms can decrease tax due to the use of R&D grants (revenues without taxation) in the absence of other tax incentives related to R&D.
{"title":"Determinants of corporate R&D expenditures: the role of taxes","authors":"Dorota Wasiluk, Anna Białek-Jaworska","doi":"10.2478/ceej-2020-0007","DOIUrl":"https://doi.org/10.2478/ceej-2020-0007","url":null,"abstract":"Abstract The paper aims to find the relationship between corporate expenditures on R&D and tax burdens comparing German with French R&D incentives. We use the OLS method for the financial and patent cross-sectional data retrieved from the Amadeus database. The results confirm that firms with higher tax spread (the difference between the nominal and effective tax rates) spend less on R&D. These are in line with findings of a positive relationship between corporate R&D investment and tax burdens. Thus, firms that invest in R&D more pay higher taxes. However, they are less profitable as the return on R&D investment is visible only in the long run. German corporate expenditures on R&D are significantly sensitive to internal funds (proxied by cash flow) and depend on debt, contrary to French. The results indicate that the French firm's age (a phase of life cycle) has a significant impact on spending on R&D compared to German. Whereas in both countries, corporate expenditures on R&D are sensitive to the number of obtained patents. The capability of reducing the level of tax burdens below the nominal tax rate in the case of older German firms stimulates them to increase their R&D expenditures. However, German firms can decrease tax due to the use of R&D grants (revenues without taxation) in the absence of other tax incentives related to R&D.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"7 1","pages":"110 - 126"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81650313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract This article discusses the determinants of the survival of new companies, with particular emphasis on their sources of financing. We have analysed the impact of experience in the same focal industry, of having a competitive advantage and intellectual property rights (patents and trademarks) and of debt financing on the probability of a start-up's survival, using a logit model based on the Kauffman Firm Survey (KFS) database data covering 4,928 American companies which operated from 2004 to 2011. Additionally, we can demonstrate that start-ups that use debt financing have a better chance of staying in business. Factors such as intellectual capital and competitive advantage are also positively correlated with the prospects for start-up survival.
{"title":"Factors Determining the Survival of New Companies","authors":"Marlena Cegiełka","doi":"10.2478/ceej-2020-0021","DOIUrl":"https://doi.org/10.2478/ceej-2020-0021","url":null,"abstract":"Abstract This article discusses the determinants of the survival of new companies, with particular emphasis on their sources of financing. We have analysed the impact of experience in the same focal industry, of having a competitive advantage and intellectual property rights (patents and trademarks) and of debt financing on the probability of a start-up's survival, using a logit model based on the Kauffman Firm Survey (KFS) database data covering 4,928 American companies which operated from 2004 to 2011. Additionally, we can demonstrate that start-ups that use debt financing have a better chance of staying in business. Factors such as intellectual capital and competitive advantage are also positively correlated with the prospects for start-up survival.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"38 1","pages":"300 - 315"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90579228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Tanzania, like most other developing countries, faces numerous economic challenges in striving to achieve sustainable economic growth and development through taxation. In the literature, the debate on how effective taxes are as a tool for promoting economic growth and economic development remains inconclusive, as various research have reported mixed effects of tax on economic growth. This article investigates the effect of taxation on economic growth in Tanzania using the recently developed technique of autoregressive distributed lag model (ARDL) bounds testing procedure for the period from 1996 to 2019. Various preliminary tests were conducted including stationary tests as well as the pair-wise Granger causality test. According to the results obtained, domestic goods and services (TGS) taxes are positively related to GDP growth and are statistically significant at 1% level. Income taxes, on the other hand, were found to be negatively related to GDP growth and to be statistically significant at 5% level. The pair-wise Granger causality results indicated that there is bidirectional Granger causality between TGS and GDP growth at 1 % significance level. The government should aim at growing, nurturing and sustaining tax base to positively drive economic growth even further.
{"title":"Tax revenue and economic growth in developing country: an autoregressive distribution lags approach","authors":"M. H. Maganya","doi":"10.2478/ceej-2020-0018","DOIUrl":"https://doi.org/10.2478/ceej-2020-0018","url":null,"abstract":"Abstract Tanzania, like most other developing countries, faces numerous economic challenges in striving to achieve sustainable economic growth and development through taxation. In the literature, the debate on how effective taxes are as a tool for promoting economic growth and economic development remains inconclusive, as various research have reported mixed effects of tax on economic growth. This article investigates the effect of taxation on economic growth in Tanzania using the recently developed technique of autoregressive distributed lag model (ARDL) bounds testing procedure for the period from 1996 to 2019. Various preliminary tests were conducted including stationary tests as well as the pair-wise Granger causality test. According to the results obtained, domestic goods and services (TGS) taxes are positively related to GDP growth and are statistically significant at 1% level. Income taxes, on the other hand, were found to be negatively related to GDP growth and to be statistically significant at 5% level. The pair-wise Granger causality results indicated that there is bidirectional Granger causality between TGS and GDP growth at 1 % significance level. The government should aim at growing, nurturing and sustaining tax base to positively drive economic growth even further.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"55 1","pages":"205 - 217"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74832614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Corruption is a factor that affects a company severely either directly or indirectly. It may have a positive or negative impact on the economic situation of the company. This article verifies the hypothesis about the corporate perception of corruption as an obstacle to business performance. It also identifies which factors do have a substantial effect on the perception of corruption by companies. The study was carried out using the logit model. The data used were obtained from the Business Environment and Enterprise Performance Survey (BEEPS) database for 2016.
{"title":"Economic analysis of corruption at the company level","authors":"Paulina Bąk","doi":"10.2478/ceej-2020-0015","DOIUrl":"https://doi.org/10.2478/ceej-2020-0015","url":null,"abstract":"Abstract Corruption is a factor that affects a company severely either directly or indirectly. It may have a positive or negative impact on the economic situation of the company. This article verifies the hypothesis about the corporate perception of corruption as an obstacle to business performance. It also identifies which factors do have a substantial effect on the perception of corruption by companies. The study was carried out using the logit model. The data used were obtained from the Business Environment and Enterprise Performance Survey (BEEPS) database for 2016.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"9 1","pages":"186 - 204"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79504467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The automotive industry is a particularly sensitive sector of the economy. Numerous legal changes have been introduced in Poland that may affect the company's liquidity and profitability. Sales of new vehicles in Poland were very high until the end of 2019. I have presented the most recently available financial data, and hence it can be concluded that they are not distorted. The article discusses the issue of cash flow statements and the associated financial ratios, as well as assesses the financial liquidity among the importers of new, ten best-selling car makers in Poland between 2015 and 2019. Moreover, I have analysed the relationship between profitability ratios and liquidity ratios as well as cash adequacy ratios during this period. According to my findings, in most cases, there is a positive and strong relationship between profitability and financial liquidity in the automotive industry.
{"title":"The relationship between profitability and financial liquidity among the importers of best-selling brands of new cars in poland","authors":"Paweł Łojek","doi":"10.2478/ceej-2020-0011","DOIUrl":"https://doi.org/10.2478/ceej-2020-0011","url":null,"abstract":"Abstract The automotive industry is a particularly sensitive sector of the economy. Numerous legal changes have been introduced in Poland that may affect the company's liquidity and profitability. Sales of new vehicles in Poland were very high until the end of 2019. I have presented the most recently available financial data, and hence it can be concluded that they are not distorted. The article discusses the issue of cash flow statements and the associated financial ratios, as well as assesses the financial liquidity among the importers of new, ten best-selling car makers in Poland between 2015 and 2019. Moreover, I have analysed the relationship between profitability ratios and liquidity ratios as well as cash adequacy ratios during this period. According to my findings, in most cases, there is a positive and strong relationship between profitability and financial liquidity in the automotive industry.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"100 1","pages":"127 - 142"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90955272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The main purpose of this paper is to determine the impact that Big 4 companies have had after the adoption of International Financial Reporting Standards (IFRS) became mandatory on the audit market. Thus, after thorough research of the specialised studies, the impact of the financial reporting based on IFRS is analysed, while considering that Big 4 companies have created a strong monopoly that led to several changes on the audit market. All the companies listed on the Bucharest Stock Exchange that traded premium shares from 2011 to 2019 were analysed. With the use of ANOVA analysis, this paper verifies if the profitability, shareholders’ funds, firm size and the size of the business group influence the choice of the audit firm. Our results confirm that the choice of an audit firm is influenced by the shareholders’ funds, number of employees and the size of the business group. Besides, this paper presents an analysis of the changes that have occurred from 2011–2019 on the audit market of Romania.
{"title":"‘Big 4’ influence on audit market","authors":"Marta Tache","doi":"10.2478/ceej-2020-0010","DOIUrl":"https://doi.org/10.2478/ceej-2020-0010","url":null,"abstract":"Abstract The main purpose of this paper is to determine the impact that Big 4 companies have had after the adoption of International Financial Reporting Standards (IFRS) became mandatory on the audit market. Thus, after thorough research of the specialised studies, the impact of the financial reporting based on IFRS is analysed, while considering that Big 4 companies have created a strong monopoly that led to several changes on the audit market. All the companies listed on the Bucharest Stock Exchange that traded premium shares from 2011 to 2019 were analysed. With the use of ANOVA analysis, this paper verifies if the profitability, shareholders’ funds, firm size and the size of the business group influence the choice of the audit firm. Our results confirm that the choice of an audit firm is influenced by the shareholders’ funds, number of employees and the size of the business group. Besides, this paper presents an analysis of the changes that have occurred from 2011–2019 on the audit market of Romania.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"1 1","pages":"143 - 156"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76705655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The main aim of this article is to examine the factors that influence the acceptance of ridesharing technologies in Polish society, including dynamic vanpooling on demand. The study was conducted using the UTAUT 2 model (Theory of Acceptance and Use of Technology). We have employed statistical and econometric data analyses such as factor analysis and linear regression using the Partial Least Square (PLS) method. Based on the review of the publications on ridesharing in the context of sharing economy, we have modified the UTAUT 2 model by supplementing it with the trust factor, which is a significant contribution to the development of this theory when applied to the acceptance of ridesharing technologies. Further, the outcomes allowed us to identify the factors that influence people's attitudes in using shared-ride technology (performance expectancy, hedonistic motivation and habit) and the intention to use this technology (effort expectancy, performance expectancy, price value, habit and trust). This study has practical implications as it has helped identify the factors that affect the acceptance of ridesharing technologies in Poland and these factors are significant for the suppliers of these technologies. The findings can certainly become a starting point for further research on other communities and the application of other models of technology.
{"title":"Ridesharing in the Polish Experience: A Study using Unified Theory of Acceptance and Use of Technology","authors":"Stefan Cylwik, Renata Gabryelczyk, M. Chlebus","doi":"10.2478/ceej-2020-0017","DOIUrl":"https://doi.org/10.2478/ceej-2020-0017","url":null,"abstract":"Abstract The main aim of this article is to examine the factors that influence the acceptance of ridesharing technologies in Polish society, including dynamic vanpooling on demand. The study was conducted using the UTAUT 2 model (Theory of Acceptance and Use of Technology). We have employed statistical and econometric data analyses such as factor analysis and linear regression using the Partial Least Square (PLS) method. Based on the review of the publications on ridesharing in the context of sharing economy, we have modified the UTAUT 2 model by supplementing it with the trust factor, which is a significant contribution to the development of this theory when applied to the acceptance of ridesharing technologies. Further, the outcomes allowed us to identify the factors that influence people's attitudes in using shared-ride technology (performance expectancy, hedonistic motivation and habit) and the intention to use this technology (effort expectancy, performance expectancy, price value, habit and trust). This study has practical implications as it has helped identify the factors that affect the acceptance of ridesharing technologies in Poland and these factors are significant for the suppliers of these technologies. The findings can certainly become a starting point for further research on other communities and the application of other models of technology.","PeriodicalId":9951,"journal":{"name":"Central European Journal of Economic Modelling and Econometrics","volume":"55 1","pages":"279 - 299"},"PeriodicalIF":0.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81273047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：