（）(所有船员) must know the locations as well as the operations of the life-saving and fire-fighting appliances.A、All officersB、All engineersC、All the crewD、AB and C
（）(所有船员) must know the locations as well as the operations of the life-saving and fire-fighting appliances.
- A、All officers
- B、All engineers
- C、All the crew
- D、AB and C
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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.