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 __________ percent for i

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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