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。
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。
参考解析
解析：
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