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)（）.<br>A:enlarge bit<br>B:casing bit<br>C:hole opener<br>D: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:enlarge bit
B:casing bit
C:hole opener
D:casing opener

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