Distribution and transfusion of the geostatic pressure variate in company with mining space in underground mining.

下开采中布与转移随开采空间变动而变动,不同的开采顺序会来不同的围岩稳定性。

The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.

人造球卫星的轨道由于大气球引场等因素的摄动,其形状近点位置将不断改变。