单选题In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.AswivelBcathead spoolCdrawworksDstand pipe
单选题
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
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