ground level

On the Methods to Keep Satellite/Ground Clocks Synchronous Accurately;

在轨卫星与地面时钟精确同步方法研究

Studying of quality problem in cement ground;

对当前水泥地面质量问题的探讨

The Formula Derivation from the Interaction Between the Free Falling Object and the Ground Force;

自由落体与地面之间作用力公式的推导

It gives an account of the environmental effect discrepancies done by surface and underground oil storage tanks,the relevant stipulations of Environmental Protection Agency(EPA),oil pollution law,National Pollutant Discharge Elimination System(NPDES)and so on.

译文叙述了地面和地下储油罐对环境影响的差异、美国环保局（EPA）对此的有关规定、石油污染法、全国污染物排除控制系统（NPDES）等。

Through discussing the quality status,the error categories of Guangxi historical surface meteorological data and its cause,it is advantageous to users in processing data objectively.

通过对广西历史地面气象资料的质量评估,分析地面历史资料整体质量状况、疑误数据类别和原因,让用户在使用数据时有一个全局和客观定量的把握。

Study on the causes of floor leakage in kitchen and toilet and preventive measures;

浅谈厨卫间地面渗漏的原因及预防措施

Quality problems of cement concrete floor and prevention measures thereof;

水泥混凝土地面的质量问题及防治措施

Development and design of automatic floor cleaning machine;

自动地面清洗机的开发设计