Research on green investment efficiency of enterprises 并列题名:Research on green investment efficiency of enterprises Research on real estate investment of state owned enterprises 并列题名:Research on real estate investment of state owned enterprises Research on the patent litigation strategy of enterprises Research on green auditing mechanism of state-owned enterprises Research on outward foreign direct investment of Chinese enterprises Research on overseas cultivated land investment of Chinese enterprises 并列题名:Research on green auditing mechanism of state-owned enterprises Study on foreign direct investment of transnational enterprises