A device used to enlarge the size of an existing bore hole, having teeth arranged on its outside circumference to cut the formation as it rotates is a(n) ______.A.enlarger bitB.casing bitC.hole openerD.casing opener
A device used to enlarge the size of an existing bore hole, having teeth arranged on its outside circumference to cut the formation as it rotates is a(n) ______.
A.enlarger bit
B.casing bit
C.hole opener
D.casing opener
相关考题：
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