题目内容

Which speed of cool is the fastest?

A. quench
B. annealing
C. tempering

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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

发展现代农业能确保国家社会主义安全和城乡居民食品安全。

A. 对
B. 错