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 vessel shall slacken her speed，stop，or reverse her engines，if necessary，to（）.
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
In most cases，when a large merchant vessel enters shallow water at high speed the（）.
Topside icing decreases vessel stability because it is usually off-center and（）.
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.
A tug’s horsepower available at the shaft is（）.
Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
Topside icing decreases vessel stability becauseit increases（）.