The heat treatment includes :
A. annealing
B. quench
C. tempering
D. shaping
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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
解决三农问题是我国现代化建设的重要任务,是我国可持续发展的中心内容。
A. 对
B. 错