When a spacecraft travels one of the major problems is reentry into the Earth’s _______.A

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When a spacecraft travels, one of the major problems is reentry into the Earth’s _______.

A.surface

B.atmosphere

C.attitude

D.bent

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗