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單項(xiàng)選擇題

“SWL” means （）.

A. safe working load
B. safe work load
C. safe worked load
D. safely working load

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單項(xiàng)選擇題

（）do you want the derrick adjusted?

A.What
B.Where
C.How
D.When

單項(xiàng)選擇題

Look, the derrick is too high. I want it adjusted （）.

A.upwards
B.forwards
C.downwards
D.backwards

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