*$_The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.?

*$_The cutting speed for drilling __________ with high speed steel dri

1.	*$_The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.?
A.	Mild steel
B.	Copper
C.	Aluminium
D.	Brass
Answer» B. Copper

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*$_The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.?

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