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Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.

单选题
2022-01-03 05:09
A、must be displayed when day signals are being used
B、must be displayed when moored to a pier
C、may be extinguished at night on open waters when no other vessels are in the area
D、may be displayed during daylight
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正确答案
D
试题解析
标签： 号灯与号型
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