单项选择题
Which vessel，when anchored at night，is NOT required to show anchor lights?（）.
A.A power-driven vessel
B.A vessel engaged on pilotage duty
C.A vessel dredging
D.A vessel restricted in her ability to maneuver
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相关考题
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单项选择题
While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.
A.not under command
B.being towed
C.on pilotage duty
D.aground
