A set of clamps that are latched onto the drill pipe to allow the driller to raise or lower the drill string out of or into the hole are the（）.<br>A:lifts<br>B:collars<br>C:elevators<br>D:clamps

A set of clamps that are latched onto the drill pipe to allow the driller to raise or lower the drill string out of or into the hole are the（）.
A:lifts
B:collars
C:elevators
D:clamps

出自：海船船员证

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