A.displaying code letter Y (Yankee)
B.sounding five short blasts on his whistle
C.displaying code numeral 5
D.sounding one prolonged blast on his whistle
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A.remains fully obliged
B.has no obligation
C.is not necessarily
D.is exempted
A.diving operations
B.dredging
C.fishing
D.mineclearance operations
A.avoid collision
B.allow more time to assess the situation
C.be stopped in an appropriate distance
D.All of the above
A.only the sternlight of the vessel
B.a sidelight and one masthead light of the vessel
C.only a sidelight of the vessel
D.any lights except the masthead lights of the vessel
A.vessel's horsepower
B.sea state
C.number of propellers
D.vessel's displacement
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A towing vessel should be on the crest of a wave at the same time as its tow and in the trough at the same time. The term used to describe this is（）.
An alternating light（）.
A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way? （）
When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
A vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
On a single-screw vessel the stern frame（）.
A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the （）limit of the channel or fairway which lies on her（）side as is safe and practicable.
In selecting a tug for moving a vessel，consideration should be given to its（）.