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问题

Reheating a hardening component to a temperature lower than the hardening temperature and


Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as .

A.low temperature hardening

B.case hardening

C.annealing

D.tempering

请帮忙给出正确答案和分析,谢谢!

参考答案
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