相关考题
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单项选择题
Be careful when you （）the derrick.
A.operated
B.operate
C.operating
D.operator -
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
