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單項(xiàng)選擇題

（）(調(diào)高) the derrick, please.

A.High
B.Top
C.Adjust
D.Lower

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單項(xiàng)選擇題

（）(降下)the derrick, please.

A. Lower
B. Top
C. Hoist
D. Take down

單項(xiàng)選擇題

Before the operation of the derrick, check all （）(索具)closely and everything must be in good condition.

A.blocks
B.goosenecks
C.tackle
D.guys

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