单项选择题

The strongest of the natural fiber ropes is（）.

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

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单项选择题
The square knot is used for（）.

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
The rope which is rove from the truck to be used with a bos’n chair is called a（）.

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