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單項(xiàng)選擇題

When the derrick is topped, the guy must be （）(放松).

A. slacked off
B. sent away
C. sent out
D. taken in

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單項(xiàng)選擇題

A （）(重吊桿)is used for lifting long heavy cargo.

A. derrick
B. crane
C. jumbo boorn
D. special crane

單項(xiàng)選擇題

You should release the （）(重型螺栓)on top of the cover.

A. lock in
B. heavy bolt
C. socket
D. heavy cleat

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