Study on the optimal situation of China's urban population Study on the fluctuation of China's cotton production Study on the privatization of China urban public utilities Study on the standardization of Chinese urban furniture Study of the modernization of China's financial regulation Study on citizenization of rural migrant population Study on the new development trend of China's urban agglomerations Study on the measurement of China's core inflation Study on the construction of China's sport standardization Study on the ecosystem of enterprise population