High speed steel drills can be operated at about _________ the speed of high carbon steel drills.

High speed steel drills can be operated at about _________ the speed

1.	High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
A.	One-half
B.	One-fourth
C.	Double
D.	Four times
Answer» D. Four times

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High speed steel drills can be operated at about _________ the speed of high carbon steel drills.

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