A drilling bit which is doughnut shaped to permit recovery of the center portion of the hole drilled is called a ______.A.diverter bitB.hole reamerC.core bitD.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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单选题Which two statements are true of a network mask?（）AA subnet mask specifies the portion of an IP address that is in a binary formatBA subnet mask specifies the portion of an IP address that is in a decimal formatCA subnet mask specifies the portion of an IP address that represents a network prefixDA subnet mask specifies the portion of an IP address that represetns network hosts
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