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应用螺旋测微器测量物体长度的问题,自从1986年至1992年的7年全国高考物理试题中先后出现过3次,但失分率很高,从我们江苏省考生的试卷分析来看,1986年得分率为42.9％,1990年得分率为43.8％,在1992年高考中,有了以上两次失分的教训,应该说情况有所好转了,然而该年得分率也仅为43％。这不得不引起我们的深思。 1 失误原因分析 1.1 考生不甚了解螺旋测微器的结构,对其精度0.01mm更是不理解其含义。实际上这精度告诉我们读数的能读到的准确位数是小数部分的百分位,而读
The use of spiral micrometers to measure the length of objects has occurred three times in the physics examinations of the national college entrance examination for seven years from 1986 to 1992. However, the rate of loss is high. From the analysis of the examination papers of our Jiangsu candidates, 1986 The annual score rate was 42.9%. The score rate in 1990 was 43.8%. In the 1992 college entrance examination, with the above two lessons learned from the two points, it should be said that the situation has improved. However, the annual score rate was only 43%. This has caused us to think deeply. 1 Analysis of Causes of Mistakes 1.1 Candidates do not understand the structure of the spiral micrometer and do not understand its meaning even if its accuracy is 0.01mm. In fact this accuracy tells us that the exact number of digits the reading can read is the percentile of the fractional part, while reading