题目内容

In order to make metal becoming softer and much easier to machine, （）is a good heat treatment.

A. quench
B. annealing
C. tempering

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We can make steel harder by ( )

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

The purpose of tempering is to ( )

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

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