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單項選擇題

There is no power for the （）(起貨機).

A.winch
B.crane
C.derrick
D.boom

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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

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B. out of date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

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