A:验证Na和水反应是否为放热反应
B:用CO2做喷泉实验
C:观察纯碱的焰色反应
D:比较Na2CO3、NaHCO3的稳定性
This medicine millions of people's lives since it was put into use.
When the man walked ______ the library, he found a cat at the corner.