Ask them to______ carefully the planes radio and radar system.A.check onB.check offC.check

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Ask them to______ carefully the planes radio and radar system.

A.check on

B.check off

C.check out

D.check up

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_________。