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农村实行生产责任制以来,农民群众希望经济有效地施用化肥的心情很迫切,每年在秋播春管时节有很多人询问施用化肥知识。现制作一种速算器,以解决这个问题。一、速算器制作和使用方法:用约一毫米厚硬纸板,划两个直径为11.5—14.5厘米同样大小的圆,照下边图样制做。两盘相合于同一圆心,底盘为数码盘,位于底部;旋盘位于上部,挖空上下两个视孔。使用时,拨动旋盘,第一步先从上孔自下而上依次对应查出:要播种的麦田属山、垣(梯田)、
Since the implementation of the responsibility system for production in rural areas, the peasant masses are eager to apply chemical fertilizers in an economical and efficient manner. Many people inquired about the application of chemical fertilizers every autumn spring. Now make a speed calculator to solve this problem. First, the speed calculator production and use: about a millimeter thick cardboard, draw two diameter 11.5-14.5 cm the same size of the circle, according to the pattern below. Two coincide in the same center of the circle, the chassis for the digital disk, located at the bottom; the revolving disk is located in the upper part, hollowed out two up and down depending on the hole. When in use, dial the dial, the first step from the bottom of the hole from the bottom up in order to find out: to sow the wheat is a mountain, Yuan (terraced fields)