Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）<br>A:low temperature hardening<br>B:case hardening<br>C:annealing<br>D:tempering

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

出自：海船船员证

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