The purpose of engine stand-by is that ____.A.the main engine in the stand-by conditionB.a

The purpose of engine stand-by is that ____.

A.the main engine in the stand-by condition

B.auxiliary machinery in the stand-by condition

C.dynamical equipments in the stand-by condition and could be used immediately

D.A and B

请帮忙给出正确答案和分析，谢谢！

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