单项选择题
If you shorten the scope of anchor cable，your anchor’s holding power（）.
A.decreases
B.increases
C.remains the same
D.has no relation to the scope
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If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.
A.crew was trying to get warm
B.vessel required immediate assistance
C.vessel was attempting to attract the attention of a pilot boat
D.vessel was being illuminated for identification by aircraft -
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If there are a number of survivors in the water after abandoning ship，they should（）.
A.tie themselves to the unit so they won't drift with the current
B.form a small circular group to create a warmer pocket of water in the center of the circle
C.send the strongest swimmer to shore for assistance
D.form a raft by lashing their life preservers together -
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If the named port is one at which no tugs are ever obtainable，and the chartered vessel can not，by reason of her size，reach that port without the assistance of tugs，the port is（）.
A.safe
B.not safe
C.good
D.not good
