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单选题
The sailors should show relevant flags by day or pilot lamps at night.()
A

水手要在白天悬挂真的信号旗和引航灯。

B

水手要在白天悬挂正确的信号旗和引航灯。

C

水手要在白天悬挂正确的信号旗,晚上开启引航灯。

D

水手要在白天和夜间悬挂正确的信号。


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