A double male coupling is one that（）.<br>A:has left hand twist<br>B:has inside threads on both ends<br>C:has outside threads on both ends<br>D:takes two men to operate

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

出自：海船船员证

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