Study on investment behavior of tourism related enterprises 并列题名：Study on investment behavior of tourism related enterprises Study on industrial relations of the nonpublic-owned enterprises Research on innovation behavior of China central enterprises 并列题名：Study on industrial relations of the nonpublic-owned enterprises Research on investment operation mechanism of Chinese coal enterprises 并列题名：Research on innovation behavior of China central enterprises Overseas investment of central state-owned enterprises Study of employment relationship in Chinese enterprises Managing strategies of tourism enterprises