在低碳钢扭转试验中，破坏后的低碳钢试样断口平齐、与轴线垂直。破坏前，该断口所在截面的 发布时间：2018-05-19 02:41 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在低碳钢扭转试验中，破坏后的低碳钢试样断口平齐、与轴线垂直。破坏前，该断口所在截面的应力有何特点？（）A.拉应力最大B.拉应力处于平均水平C.拉应力最小D.剪应力最大E.剪应力最小
题型：单项选择题 完形填空。 Some one says," time is money." But I think time is 1 important than money. Why? Because when money is spent, we can get it back. however, when time is 2 , It'll never return. That is 3 we must't waste time. It goes without saying that time is usually limited. Even a second is very important. we should make full use of our time to do 4 useful. But it is a pity that there are a lot of people who don't know the important of time. They 5 their limited time smoking, drinking and playing cards. They don't know that wasting time means wasting part of their own 6 . In a word, we should save time. we shouldn't leave today's work for tomorrow, Remember: we have no time to lose. ( )1. A. less ( )2. A. lost ( )3. A. what ( )4. A. nothing( )5. A. spend ( )6. A. work B. much less B. finished B. because B. something B. take B. money C. even more C. bought C. why C. anything C. pay C. lives 查看答案