一数下1：认识图形（二）

https://v.qq.com/txp/iframe/player.html?vid=e0386es0ux8&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=f0515yk82nb&width=500&height=375&auto=0

复制网址 www.1ydt.com 打开下载完整全册word试卷教案及PPT课件点击阅读原文看全部教学内容

https://v.qq.com/txp/iframe/player.html?vid=o0524rnovo4&width=500&height=375&auto=0