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1993年高考游标卡尺一题,考生把104.05mm,错读成14.05mm、104.1mm、104.050mm等类似数字。造成这些错误的原因是: 1.把主尺上10cm错读成10mm,或把主尺上厘米数、毫米数相加时单位未统一。 2.仪器的精度未搞清。把游标尺上20个小等分刻度当作是10等分刻度的游标卡尺去读。 3.游标卡尺读数规则没有掌握。下面就此谈几点教学建议和教学体会。游标卡尺的教学是以游标尺上10个等分刻度为例进行的。至于游标尺上20个、50个等分刻度的游标卡尺在教学中可能也只是一略而过。在前几年高考试卷中出现的也是第一种,没有引起师生的对后两种的
In the 1993 college entrance exam vernier caliper, candidates took 104.05mm, wrongly read 14.005mm, 104.1mm, 104.050mm and other similar figures. The causes of these errors are: 1. The unit is not uniform when the 10cm on the main ruler is incorrectly read as 10mm, or when the number of centimeters and millimeters on the main ruler is added. 2. The accuracy of the instrument is not clear. The 20 small division marks on the vernier scale are read as vernier calipers with 10 division marks. 3. Vernier caliper reading rules are not mastered. Here to talk about some teaching suggestions and teaching experience. The teaching of the vernier caliper takes 10 equal divisions on the vernier scale as an example. As for the vernier caliper with 20 and 50 equally divided scales on the vernier scale, it may only be a slight pass in teaching. In the past few years in the high exam volume, it was also the first one. It did not cause the teachers and students to have the latter two.