单项选择题
Containers are loaded and discharged by （）(龙门吊).
A. ship’s derricks
B. fork trucks
C. gantry cranes
D. shore cranes
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相关考题
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单项选择题
Our heavy derrick has been （）(不用)for a long time.
A. out of order
B. out of date
C. out of danger
D. out of use -
单项选择题
（）(调高) the derrick, please.
A.High
B.Top
C.Adjust
D.Lower -
单项选择题
（）(降下)the derrick, please.
A. Lower
B. Top
C. Hoist
D. Take down
