Chrome，
QQ浏览器
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
![人教A高中数学必修四2.4.1 平面向量数量积的物理背景及其含义[王丽娜]【市一等奖】优质课](//imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2Fef3ec3fcc83f42203339af1a9ec2d6569c74d6bc.jpg%40672w_378h_1c_%21web-search-common-cover)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
播放：23 时间：2024-06-19简介：
.
![人教A高中数学必修四2.4.1 平面向量数量积的物理背景及其含义[王丽娜]【市一等奖】优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2Fef3ec3fcc83f42203339af1a9ec2d6569c74d6bc.jpg%40672w_378h_1c_%21web-search-common-cover)
.