單項選擇題

Is that all right at this（）?

A.high
B.heigh
C.height
D.higher

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單項選擇題

What’s the （）of the derrick?

A.SLW
B.LSW
C.SWL
D.FWE

單項選擇題

“SWL” means （）.

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