Research on the income distribution pattern and its optimization Research on the income distribution effects of foreign direct investment Research on the lncome distribution gap of residents and the optimization of tax system structure Research on basic public service mechanism and its optimization Research on income distribution in China Research on national income distribution and income inequality Research on China's agricultural export market structure and its optimization 并列题名：Research on the lncome distribution gap of residents and the optimization of tax system structure Research on business ecosystem of internet platform enterprises and its optimization 并列题名：Research on basic public service mechanism and its optimization