Study on the legal regulation of government purchasing aged care service 并列题名：Study on the legal regulation of government purchasing aged care service Study on the responsibility model of government in purchasing public service Study on the administrative law regulation of government purchase of services Research on the quality assurance of government purchasing public service 并列题名：Study on the responsibility model of government in purchasing public service 并列题名：Study on the administrative law regulation of government purchase of services Study on the legal regulation of pension funds investment Study on government purchasing social services Study on anti-monopoly regulation of governmental restriction on competition