单选题In towing，heaving lines are used for（）.Apassing a tow bridle to the tugBpassing a messenger lineCheaving in the tow bridleDservice lines with rocket line throwers
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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