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现介绍一种有趣而生动的挂图,它可以帮助学生很快的获得草田农作制的概念,在巩固和加深学生的知识方面具有很大的意义。它和一般的“图板式草田农作制”图表不同,制法是用厚纸板做,分甲乙二块,在甲纸板上绘好土地轮作区划的图形,如七年轮作制则绘七区,并在每区上开一圆孔,每个圆孔排列成圆形,孔与孔之间等距(如图甲、乙)。在绘制时,
An interesting and vivid flip chart is introduced to help students gain quick access to the concept of grassland farming and is of great significance in consolidating and deepening students’ knowledge. It is different from the general diagram of “planted grassland farming system”. The system is made of cardboard and is divided into two sections, two sections of which are painted on a cardboard deck. For example, seven-year rotation system draws seven sections, And in each area to open a round hole, each round hole arranged in a circle, the hole and the hole between the equidistant (Figure A, B). When drawing,