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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单项选择题

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

单项选择题

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

单项选择题

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