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
更多“Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.”相关的问题
A、purple B、orange C、blue D、yellow
A、two all-round red lights in a vertical line B、two yellow towing lights in a vertical line C、two white masthead lights in a vertical line D、two lights on the stern，one yellow and one white
A、Steering gear and windlass B、Navigation light and radio power panel C、Navigation device power box D、Daily fresh water pump
A、Mayday，Mayday，Mayday B、Pan，Pan，Pan C、Security，Security，Security D、Lights out，Lights out，Lights out
A、Three lights in a vertical line，the highest and lowest red and the middle white，and anchor lights B、Three lights in a vertical line，the highest and lowest red and the middle white，ONLY C、Anchor lights ONLY D、Anchor lights and sidelights ONLY
A、ascending the river B、descending the river C、crossing the river D、proceeding towards sea
A、date of construction or establishment B、length of time between flashes of the light C、time required for the longest flash of each cycle D、time required for the light to complete each cycle
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