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單項選擇題

What is meant by the term two-blocked（）.

A.The bottom block touches the top block
B.The line has jumped the sheaves
C.There are turns in the fall
D.You have two blocks

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單項選擇題

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

單項選擇題

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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