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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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