In space ______and equipment need many forms of protection.A.pilotsB.astronautsC.engineers

学历类 专四 已帮助 人

In space,______and equipment need many forms of protection.

A.pilots

B.astronauts

C.engineers

D.scientists

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。