单项选择题
A.low temperature hardening B.case hardening C.annealing D.tempering
Which of the listed effects represents the purpose of h...
单项选择题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
Which of the following nondestructive testing methods c...
单项选择题Which of the following nondestructive testing methods can be used to detect a suspected subsurface defect in a tail-shaft liner?（）
A.Dye penetrant B.Magnetic particle C.Ultrasonic D.All of the above
To anneal a copper gasket, you should heat the gasket（）...
单项选择题To anneal a copper gasket, you should heat the gasket（）
A.and quench it in oil B.cherry red and quench in water C.and let it cool slowly in the air D.and carbonize
