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單項(xiàng)選擇題

The （）(重吊桿) can lift heavy cargo.

A. heavy cargo derrick
B. heavy deck
C. jumbo boom
D. heavy block

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單項(xiàng)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

單項(xiàng)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