Macroprecipitation
常量沉淀
🗣️ 情景例句
What time is it?
什么时间啦？
Lily is a Sophomore now.
莉莉现在大学二年级。
below 20 per cent, its bactericidal action is negligible.
浓度低于20％时，杀菌能力基本上就不存在了。