Chrome，
QQ浏览器
.
![人教版高中化学必修一1_《3.2几种重要的金属化合物》[申老师]『市一等奖』优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2Fd01afe56d351d94923119925b49c7b10ae3f091d.jpg%40672w_378h_1c_%21web-search-common-cover)
.