Study on optimization of tax structure in the China's tax reform 并列题名：Study on optimization of tax structure in the china's tax reform Study on optimization of capital structure of listed agribusinesses 并列题名：Study on optimization of capital structure of listed agribusinesses Study on the optimization of Macau's industrial structure under one country two systems Study on the optimization of Macau's industrial structure under one country two systems. Research on optimization of operation strategies in the on-demand service platform 并列题名：Study on the optimization of Macau's industrial structure under one country two systems