Study on the fluctuation of China's cotton production Study on the construction of China's sport standardization Study on the optimal situation of China's urban population Study on the implementation of China's child protection system Study on dilemma and way out of China's soybean production Study on the functions of China's court Study on the evaluation of Chinese poverty reduction policies Study on the measurement of China's core inflation Study of the modernization of China's financial regulation Study on the privatization of China urban public utilities