题目内容

The purpose of tempering is to ( )

A. make steel softer
B. make steel harder
C. relieve the internal stresses

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Which speed of cool is the fastest?

A. quench
B. annealing
C. tempering

The heat treatment includes :

A. annealing
B. quench
C. tempering
D. shaping

Shaping operations of metal include :

A. casting in moulds
B. forging
C. squeezing
D. bending

Anealing has two advantages,

A. relieve internal stress
B. make metal softer
C. make metal harder
D. make metal cracking