自制教具一般侧重于课堂教学,而生活中的应用性教具却较少。对此,笔者以食盐水为切入点,谈谈简易手提冰箱的制作,希望大家通过此案例加深对“自制教具”的理解,以拓宽“自制教具”的外延。一、制作背景手提冰箱早已不是什么新鲜概念,但市场上的手提冰箱一般仅限于车载式或电源式,使用不方便;另 Self-made teaching aids generally focus on classroom teaching, but in the application of life there are fewer teaching aids. In this regard, the author with salt water as the starting point, talk about simple hand-made refrigerator, I hope everyone through this case to deepen the “self-made teaching aids ” to broaden “self-made teaching aids ” extension. First, the production background Portable refrigerator has long been not a new concept, but the market is generally limited to portable refrigerator or power-type, inconvenient to use; the other