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單項選擇題

Containers are loaded and discharged by （）(龍門吊).

A. ship’s derricks
B. fork trucks
C. gantry cranes
D. shore cranes

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單項選擇題

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B. out of date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

單項選擇題

（）(調(diào)高) the derrick, please.

A.High
B.Top
C.Adjust
D.Lower

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