论文部分内容阅读
为使学生迅速理解和掌握“相遇问题”的本质特征,可制作下述教具进行演示.材料长80厘米、宽35厘米、厚1～1.5厘米的光滑木板一块;开有凹槽的厚1厘米、直径分别为3、4、5、6厘米的大小轮子各1个;直径为2～3厘米的小轮子3个(自己做或到圆木店买);长1.8～2米纱绳一根;长4～5厘米、宽2～3厘米的尼龙搭扣和所需图片若干;直径2～2.5毫米、长3～3.5厘米,两端有螺纹和螺帽的螺杆若干根.制作在木板左右两边分别钻1个2～3毫米的小孔,用螺杆装上小轮子,如图中的(1)和(2);
To enable students to quickly understand and grasp the essential characteristics of “encounter problems”, the following teaching aids can be made to demonstrate that the material is 80 cm long, 35 cm wide and 1 to 1.5 cm thick in smooth wooden plank; 1 cm in diameter and 3 wheels in diameter of 3, 4, 5 and 6 cm respectively; 3 small wheels of 2 to 3 cm in diameter (bought by themselves or in the log shop); 1.8-2 m long rope A; 4 to 5 cm long, 2 to 3 cm wide Velcro and the required number of pictures; Diameter of 2 to 2.5 mm, length 3 to 3.5 cm, both ends of the screw and nut a number of roots. Drill a 2 ~ 3 mm hole on the left and right sides of the board, and install the small wheel with a screw, as shown in (1) and (2) in the figure;