The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?

The minimum carbon content in steel should be ____________________ per

1.	The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?
A.	0.2
B.	0.4
C.	0.6
D.	0.8
Answer» B. 0.4

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The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?

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