In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.<br>A:swivel<br>B:cathead spool<br>C:drawworks<br>D:stand pipe

In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
A:swivel
B:cathead spool
C:drawworks
D:stand pipe

出自：海船船员证

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