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

地下开中地压分布与转移随开空间变动而变动,开会来围岩稳定性。

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

人造地球卫星轨道由于大气阻力和地球引力场等因素摄动,其形状和近地点位置将断改变。