问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C