他们应该明白不同报警信号的意义。（）<br>A:They should be clear about all fire-fighting equipment..<br>B:They should be understood about the meaning of the different alarm signals.<br>C:They should be clear about all life-saving equipment.<br>D:They should be clear about the meaning of the different alarm signals.

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.

出自：船舶水手证

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