The purpose of engine stand-by is that （）<br>A:the main engine in the stand-by condition<br>B:auxiliary machinery in the stand-by condition<br>C:dynamical equipments in the stand-by condition and could be used immediately<br>D:A and B

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

出自：海船船员证

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