單項選擇題

In a crossing situation on open waters，a sailing vessel shall keep out of the way of all the following vessels EXCEPT a vessel（）.

A.not under command
B.restricted in her ability to maneuver
C.engaged in towing
D.fishing

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單項選擇題

If your vessel is underway in fog and you hear one prolonged and three short blasts，this is a （）.

A.vessel not under command
B.sailing vessel
C.vessel being towed (manned)
D.vessel being towed (unmanned)

單項選擇題

If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.

A.speed and course
B.speed alone
C.course alone
D.speed or course