单项选择题
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown
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A.underway，but not making way
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D.not engaged in pilotage duty -
单项选择题
A navigator fixing a vessel’s position by radar （）.
A.should never use radar bearings
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