钢筋冷拉后可提高其屈服强度和极限抗拉强度,而时效只能提高其屈服点。
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δ5是表示钢筋拉伸至变形达5%时的伸长率。
A. 对
B. 错
钢材中含磷影响钢材的热脆性,含硫影响钢材的冷脆性。
A. 对
B. 错
钢材的冲击韧性值越大,表示钢材抵抗冲击荷载的能力越强。
A. 对
B. 错
1.After being rescued from the earthquake, the people agreed that they had a lot _______ .
A. to thank
B. to be thanked
C. to be thankful
D. to be thankful for