常用水泥中，具有水化热较小特性的是（）水泥。
A.硅酸盐
B.普通
C.火山灰
D.粉煤灰
E.复合
参考答案：C, D, E
解析：六大常用水泥中，只有硅酸盐水泥和普通水泥具有凝结硬化快/较快，早期强度高/较高，水化热大/较大的特性，其余的四种常用水泥（矿渣水泥、火山灰水泥、粉煤灰水泥、复合水泥）均具有凝结硬化慢，早期强度低，水化热较小的特性；故本题正确选项应为“C、D、E”。 考点 建筑材料
| 完形填空。 | ||||
| When you're a teenager (青少年) it seems that every time you say, "I want to...", your parents answer, "No, you can't." Young people further complain that their parents do not 1 them. When something goes 2 , most parents just don't believe in their children. 3 asking why, they think their kids are wrong. And not many parents allow their kids to choose for themselves. Yes, 4 is true that your parents sometimes treat you as a little child. But remember that not long ago you were really a child. Your parents still remember the childish 5 you used to make. They want to protect you 6 you don't want them to do so. So, if you want to get 7 freedom (自由), please try to understand your parents and don't lie to them. Try a more friendly way. If you want them to 8 you to stay out late, don't just say "All 9 kids can stay out late." Tell them as much as you can about what you want to do and where you'll be and 10 it's important for you to stay out late. Then they just might say, "Yes". | ||||
|