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单选题
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
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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As in the case of a voyage charter-party，it is implied in all bills of lading that ______ will be made from the contractual route unless such deviation is justified．A.deviationB.no deviationC.navigationD.no navigation
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According to the Rules, when should lights be displayed?______.A.During the hours of darknessB.At all times when underwayC.From sunset to sunrise and restricted visibilityD.Sunrise to sunset
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单选题According to the Rules，when should lights be displayed?（）.A
During the hours of darknessB
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单选题You are on a vessel that cannot comply with the spacing requirement for masthead lights.What is required in this situation（）.A
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The vessel must be altered to permit full compliance with the rulesD
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maximum horsepower of your vesselB
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单选题A vessel not under command making way at night would show（）.A
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American Bureau of Shipping classification rulesB
International Regulations for Preventing Collisions at SeaC
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单选题A jack-up drilling rig being towed must（）.A
turn off all lights that interfere with the navigation lightsB
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单选题An anchored vessel is servicing an aid to navigation and is restricted in her ability to maneuver. Which lights will she show? （）A
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two all-round red lights in a vertical lineB
three all-round red lights in a vertical lineC
two all-round yellow lights in a vertical lineD
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be displayed only while transferring cargo and fast to a dockD
use black lettering on a white background
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