The purpose of engine stand-by is that （）
- Athe main engine in the stand-by condition
- Bauxiliary machinery in the stand-by condition
- Cdynamical equipments in the stand-by condition and could be used immediately
- DA and B
问题
The purpose of engine stand-by is that
参考解析：
分类：船舶电气与船舶安全题库
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