_ High speed steel tools retain their hardness up to a temperature of$

1.	_ High speed steel tools retain their hardness up to a temperature of$?
A.	250¬¨‚àûC
B.	350¬¨‚àûC
C.	500¬¨‚àûC
D.	900¬¨‚àûC
Answer» E.

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_ High speed steel tools retain their hardness up to a temperature of$?

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