质点组对某一固定参考点的总角动量等于质点组质心对该点的角动量与在质心系中质点组相对质心的角动量之和。
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With so many stars in the ______, are we alone, or is there life out there in space?
The result of being employed proves that ____________________ (我的从教经验对我有利). (stand ... in good stead)
This article has analyzed the ______ of crime psychology theoretically. (formation, form)
航天器再入返回过程中,处于过渡段的航天器是没有任何控制力存在的。