相关考题
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单项选择题
（）using the derrick at once，the gooseneck is bent.
A.Continue
B.Start
C.Commence
D.Stop -
单项选择题
（）this the Chief Officer agreed not to put any remarks.
A.At
B.By
C.For
D.Upon -
单项选择题
（）there danger of explosion?
A.Is
B.Has
C.If
D.Do
