问题
单项选择题
Stop()the derrick at once, the gooseneck is bent.
A.to use
B.to operate
C.maneuvering
D.using
答案
参考答案:D
Stop()the derrick at once, the gooseneck is bent.
A.to use
B.to operate
C.maneuvering
D.using
参考答案:D