单选题Which of the listed effects represents the purpose of heat treating steel?（）ADevelop ductilityBImprove machining qualitiesCRelieves stressesDAll of the above
单选题
Which of the listed effects represents the purpose of heat treating steel?（）
A
Develop ductility
B
Improve machining qualities
C
Relieves stresses
D
All of the above
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