（） must know the location as well as the operation of the life-saving and fire-fighting appliances.A、All officersB、All engineersC、All the crewD、All sailors
（） must know the location as well as the operation of the life-saving and fire-fighting appliances.
- A、All officers
- B、All engineers
- C、All the crew
- D、All sailors
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问答题Let the children learn what all educated persons must some day learn, how to measure their own understanding, how to know what they know or do not know.