什么是钢材的疲劳或疲劳破坏？
参考答案：
钢材在循环应力多次反复作用下裂纹生成、裂纹扩展、以至钢材断裂破坏的现象称为钢材的疲劳和疲劳破坏。
—How was the 2008 Beijing Olympic opening ceremony?
—_______ that the whole world was attracted.
A．It was very fantastic
B．Such fantastic was it
C．So fantastic was it
D．So fantastic it was
根据我国《证券发行与承销管理办法》的规定，首次公开发行股票数量在（）亿股以上的，可以向战略投资者配售股票。
A．2
B．2．5
C．3．5
D．4
