单项选择题

The（）(自动舱盖) is operated by electric or hydraulic power.

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

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上一题目录下一题

单项选择题

A. hydraulic hatch cover
B. hydraulic release unit
C. hydraulic oil jack
D. automatic hatch cover

单项选择题

A.material
B.planks
C.mats
D.dunnage

单项选择题

A. derrick
B. heavy derrick
C. shore crane
D. floating crane