单项选择题

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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单项选择题

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

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