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单选题
In towing，heaving lines are used for（）.
A
passing a tow bridle to the tug
B
passing a messenger line
C
heaving in the tow bridle
D
service lines with rocket line throwers
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Meet in front of the muster station.B
Get hold of the ladder.C
Drop me a heaving line to lift my bag.D
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use lye or other mild detergentB
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use cleaning fluid on nylon，dacron and other synthetic lines
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square knotB
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单选题Fittings used for towing must be（）.A
Coast Guard approvedB
stamped with maximum working loadsC
securely fastenedD
positioned exactly at the bow of the towed vessel
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