Scratch编程教案6.运算积木

教程：https://mp.weixin.qq.com/s?__biz=MzA5NzMyMTMyMg==&mid=2448663917&idx=1&sn=6769e95098ca76807ab71bc02b823ef4&chksm=84a5ad68b3d2247ee806b51c8cb24652668a0bf25687a43c2f293b0c631be9253cad1f3f7ce8&scene=21#wechat_redirect
案例：
换算单位