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單項選擇題

The common type of liquid cargo is （）.

A.oil
B.chemical
C.gas
D.timber

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單項選擇題

-Why do you stop working?
- The winch is （）.

A. work well
B. in good order
C. out of order
D. good

單項選擇題

The safe working load of the （）is 100 tons.

A.single derrick
B.derrick
C.heavy derrick
D.deck

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