單項選擇題

The safe working load of the derrick is （）.

A.5 tons
B.5 metres
C.5 feet
D.5 years

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單項選擇題

It’s going to rain. Don’t forget （）the hatches.

A. to close
B. to open
C. to close and open
D. closing

單項選擇題

The crane is （）. Could you ask somebody to repair it?

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