铸件的铸造应力主要是由（）引起的。A.液态收缩 B.凝固收缩 C.固态收缩 D.热处 发布时间：2017-06-26 19:09 │ 来源：www.tikuol.com 题型：单项选择题 问题： 铸件的铸造应力主要是由（）引起的。A.液态收缩B.凝固收缩C.固态收缩D.热处理后收缩
题型：单项选择题 从方框中选择正确答句，将其序号填入题前括号里。A. I sang and danced on my holiday. B. Yes. I had a lot of fun on my holiday. C. I went to the zoo last weekend. D. I went to America on my holiday. E. I went by train on my holiday.( ) 1. Where did you go on your holiday? ( ) 2. How did you go on your holiday? ( ) 3. What did you do on your holiday? ( ) 4. What did you do last weekend? ( ) 5. Did you have a good time on your holiday? 查看答案
题型：单项选择题 累积增长量与逐期增长量的关系有（）A.前者基期不变，后者基期逐期在变动B.二者存在关系式：逐期增长量之和=累积增长量C.相邻的两个逐期增长量之差等于相应的累积增长量D.根据这两个增长量都可以计算平均每期增长量E.这两个指标都是相对指标 查看答案