问题
单项选择题
A double male coupling is one that（）.
A.has left hand twist
B.has inside threads on both ends
C.has outside threads on both ends
D.takes two men to operate
答案
参考答案：C
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A double male coupling is one that（）.
A.has left hand twist
B.has inside threads on both ends
C.has outside threads on both ends
D.takes two men to operate
参考答案：C