单项选择题
Stop（）the derrick at once，the gooseneck is bent.
A.to use
B.to operate
C.maneuvering
D.using
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On no account（）to be exceeded.
A.is the S.W.L. of the crane
B.are the S.W.L. of the crane
C.the S.W.L. of the crane is
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Oil product samples should be taken from the（）.
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D.All of the above
