国家标准规定,水泥的安定性可用什么方法检验?
参考答案:煮沸法
考考你的记忆力,根据句意想一想首字母开头的单词应该是哪个?
1. That thing made me p_____.
2. Georgia, you are a u_____ person.
3. I think my little sister has special t_____.
4. We all chose Li Hua as our l_____.
5. Have you w_____ anything, Tom ?
6. They have a_____ watched the match.
下列对热化学方程式 H2(g)+I2(g)═2HI(g);△H=+52kJ•mol-1的叙述中,正确的是( )
A.1mol氢气和1mol碘蒸气完全反应能放出52kJ的热量
B.1个氢分子和1个碘分子完全反应需要吸收52kJ的热量
C.1molH2(g)与1molI2(g)完全反应生成2mol的HI气体需吸收52kJ的热量
D.12molH2(g)与12molI2(g)完全反应放出26kJ的热量