在教学条件比较差的农村小学,缺少实验器材,教师可以因陋就简,自己动手制作月球模型进行月相变化实验。取一只乒乓球,一半涂成黑色,在黑白分界线上下各钻一个小孔。用木板做一个底座,中心穿插一根铁丝,把乒乓球套在铁丝上,用胶布在铁丝上绕几圈,一定要挡住乒乓球不下落。学生实 In rural primary schools, where teaching conditions are relatively poor, lack of experimental equipment allows teachers to make lunar phase changes experimentally for their own sake. Take a ping pong ball, half painted in black, and drill a hole up and down the boundary between black and white. Make a base of wood, interspersed with a wire center, the table tennis set in the wire, with tape on the wire around a few laps, we must block the table tennis does not fall. Students are real