【单选题】I must say, it’s a very offer. The pay is higher and the working conditions are much better.
【简答题】矿业废渣中的主要化学元素是______、______、______、______、______、______、______、______、______、______等。
【简答题】The [Ag + ] of a solution is 4.0×10 -5 . Calculate the [Cl - ] that must be exceeded before AgCl can precipitate.