A.can be observed visually
B.can be observed by radar
C.can be located on the radar
D.can be heard
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A.on the way
B.at anchor
C.made fast to a terminal
D.moving against water
A.a non-power driven vessel
B.a sailing vessel
C.a power driven vessel
D.a power driven vessel or a non-power driven vessel
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
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
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
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When one of two vessels（）is required to keep out of the way the other must keep her course and speed.
When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.
You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.
You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should（）.
When you doubt the existence of risk of collision,（）.
You are underway in reduced visibility.You hear the fog signal of another vessel about 20° on your starboard bow.Risk of collision may exist.You should（）.
You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.
Which one of two crossing power-driven vessels has the right of way in a fog（）.
When visibility is restricted（），we can say it is restricted visibility.
When underway in a channel，you should if safe and practicable（）.