Chrome，
QQ浏览器
.
![『获奖』青岛版小学数学六年级下册《4一（比例尺）》[刘老师]【市一等奖】优质课_优质课公开课教学视频](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F589c4e72451b086967eb5247cacb0e0328519836.jpg%40672w_378h_1c_%21web-search-common-cover)
.