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單項選擇題

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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單項選擇題

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

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