单选题Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）Alow temperature hardeningBcase hardeningCannealingDtempering
单选题
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
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