题目

— So much work needs to be finished in such a short time. — _________  I’ll give you a hand. A. Not to worry.                      B. So what? C. You can’t be too careful!  D. That’s right. 答案：A下面提到的问题中，与盐的水解有关的是 ( )①明矾和FeCl3可作净水剂②为保存FeCl3溶液，要在溶液中加少量盐酸③用NaHCO3与Al2(SO4)3两种溶液可作泡沫灭火剂④在NH4Cl溶液中加入金属镁会产生氢气A．①③④ B．②③ C．全部 D．①②④