单项选择题

The tackle that raises and lowers the boom is（）.

A.the cargo fall
B.The cargo hoisting wire rope
C.the topping lift
D.the cargo whip

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单项选择题

A.Nylon
B.Dacron
C.Manila
D.Sisal

单项选择题

A.forming temporary eyes in lines
B.joining two lines of equal size
C.keeping line from unlaying or fraying
D.joining two lines of different size

单项选择题

A.gantline
B.life line
C.strop
D.whip