中学物理仪器中,有些带刻度的、要求学生读数的演示仪器,教学挂图由于刻度线太细,或者刻度之间的间隔太小,使得坐在教室中、后排的学生难以看清楚。如比重计、天平、游标卡尺、千分尺等仪器及天平、千分尺等挂图的刻度线都是这样,要解决这个问题,只要把刻度线加 In middle school physics instruments, there are some scaled demonstration instruments that require student readings. Because the scale line is too thin or the interval between the scales is too small for the teaching wall chart, students sitting in the classroom and in the back row are difficult to see clearly. Such as hydrometers, balances, vernier calipers, micrometers and other scales and scales such as scales, micrometers, etc. are the same, to solve this problem, as long as the tick