单项选择题
Underway vessels shall at all time maintain a proper look-out（）.
A.by sight and hearing only
B.by all available means besides sight and hearing
C.by all available means except sight and hearing
D.by none of above means
相关考题
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单项选择题
Under International Rules（）.
A.all vessels must carry an after range light
B.vessels less than 50 meters in length need not carry an after range light
C.vessels stopped dead in the water should turn off their range lights
D.vessels over 20 meters in length must carry both range lights from sunset to sunrise -
单项选择题
The wind is ESE，and a sailing vessel is steering NW. Which fog signal should she sound?（）
A.One blast at one-minute intervals
B.One blast at two-minute intervals
C.Two blasts at one-minute intervals
D.One prolonged and two short blasts at two-minute intervals -
单项选择题
The term restricted visibility，when used in the Rules，refers to（）.
A.situations when you can see vessels on radar that you cannot see visually
B.visibility of less than half a mile
C.any condition where visibility is restricted
D.visibility where you cannot see shore
