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單項(xiàng)選擇題

When the derrick is stopped, the guy must be （）(收好).

A.taken in
B.slacked off
C.adjusted
D.stowed

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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

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

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