A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.<br>A:master bushing<br>B:kelly slips<br>C:kelly bushing<br>D:rotary bushing

A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.
A:master bushing
B:kelly slips
C:kelly bushing
D:rotary bushing

出自：海船船员证

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