单选题The purpose of engine stand-by is that （）Athe main engine in the stand-by conditionBauxiliary machinery in the stand-by conditionCdynamical equipments in the stand-by condition and could be used immediatelyDA and B
单选题
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
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