Because the surface body can show various forms of state, so the limited space and composition also show a variety of morphological.
因为面体可以展现各种形式的状态，所以空间的限定及构成也随之展现多种形态。
A time optimal control method switched by time is put forward in the paper based on the concept of subspace of the initial state space. It doesn't need switching curve or switching surface.
基于初始状态空间下的子空间概念，提出一种按时间进行切换的最速控制方法，不需要求取开关线或开关面。
The charging study of the spacecraft surface indicates that the charging state is closely related to the space electrical environment and spacecraft oneself.
航天器表面充电研究表明充电状态与空间电环境和航天器自身情况有着极为密切的关系。
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