单项选择题
Be careful when you （）the derrick.
A.operated
B.operate
C.operating
D.operator
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相关考题
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单项选择题
Is that all right at this（）?
A.high
B.heigh
C.height
D.higher -
单项选择题
What’s the （）of the derrick?
A.SLW
B.LSW
C.SWL
D.FWE -
单项选择题
“SWL” means （）.
A. safe working load
B. safe work load
C. safe worked load
D. safely working load
