单项选择题
The use of（）between bags may lead to chafe and tearing of the bags.
A.strips of burlap
B.heavy paper
C.dunnage boards
D.strips of rope yarn
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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 -
单项选择题
The strongest of the natural fiber ropes is（）.
A.Nylon
B.Dacron
C.Manila
D.Sisal -
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
