Which of the listed effects represents the purpose of heat treating steel?（）<br>A:Develop ductility<br>B:Improve machining qualities<br>C:Relieves stresses<br>D:All of the above

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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