单项选择题
The （）(双杆联吊) 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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相关考题
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单项选择题
The （）(包装货) is loaded and unloaded by cargo sling.
A. bagged cargo
B. packed cargo
C. cased cargo
D. deck cargo -
单项选择题
The（）(折叠式舱盖) can fold slowly.
A. rolling type hatch cover
B. side-rolling hatch cover
C. folding type hatch cover
D. automatic hatch cover -
单项选择题
The（）(侧滚式舱盖) runs along the guide rail.
A. rolling type hatch cover
B. side-rolling hatch cover
C. folding type hatch cover
D. automatic hatch cover
