A drilling bit which is doughnut shaped to permit recovery of the center portion of the hole drilled is called a（）.<br>A:diverter bit<br>B:hole reamer<br>C:core bit<br>D:conventional bit

A drilling bit which is doughnut shaped to permit recovery of the center portion of the hole drilled is called a（）.
A:diverter bit
B:hole reamer
C:core bit
D:conventional bit

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