相关考题
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单项选择题
“SWL” means （）.
A. safe working load
B. safe work load
C. safe worked load
D. safely working load -
单项选择题
（）do you want the derrick adjusted?
A.What
B.Where
C.How
D.When -
单项选择题
Look, the derrick is too high. I want it adjusted （）.
A.upwards
B.forwards
C.downwards
D.backwards
