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

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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

單項選擇題

The（）(折疊式艙蓋) can fold slowly.

A. rolling type hatch cover
B. side-rolling hatch cover
C. folding type hatch cover
D. automatic hatch cover