All the crew must know the locations as well as the （）of the life-saving and fire-fighting appliances.A、operateB、operatingC、operationsD、operated
All the crew must know the locations as well as the （）of the life-saving and fire-fighting appliances.
- A、operate
- B、operating
- C、operations
- D、operated
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他们应该明白不同报警信号的意义。（）A、They should be clear about all fire-fighting equipment..B、They should be understood about the meaning of the different alarm signals.C、They should be clear about all life-saving equipment.D、They should be clear about the meaning of the different alarm signals.
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（） 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
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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.