Based on the characteristics of urban-rural dual economic structure in China,we build a dynamic endogenous urban-rural d......

This study was planned to evaluate the effect of pregnancy on diurnal variation of intraocular pressure(IOP) after placi......

结合葡南油田的油藏特性和开发动态,在研究地层流出动态、环空测试模拟计算方法的基础上,以系统效率为目标函数,运用油水井供排协......

采用星风质量吸积的角动量守恒模型,用Monte-Carlo方法研究了普通红巨星双星系统和钡星的轨道根数的变化规律.由于钡星系统是由普......