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單項(xiàng)選擇題

After operation, you should （）the motor.

A.start
B.open
C.stop
D.turn on

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單項(xiàng)選擇題

Chief Officer, the cargo（）is broken.

A.runner
B.run
C.running
D.runned

單項(xiàng)選擇題

Wire ropes should be greased （）.

A. every month
B. every two months
C. every three months
D. A or B

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