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單項選擇題

The（）(千斤索) is a wire used to take the weight off.

A. light derrick
B. union purchase
C. topping lift
D. heavy derrick

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單項選擇題

The （）(雙桿聯(lián)吊) is that two booms are used with a single hook.

A. derrick
B. union purchase
C. topping lift block
D. crane

單項選擇題

The （）(包裝貨) is loaded and unloaded by cargo sling.

A. bagged cargo
B. packed cargo
C. cased cargo
D. deck cargo