1问题提出高中物理人教版《选修3-1》第105页关于游标卡尺的读数举例如下(图1),被测长度l=30 mm-7×0.9mm=23.7mm.教材另以蓝色阴影框指出:“使用一般的刻度尺也能读到毫米以下一位,但那是估读.使用这种游标卡尺得到的读数是准确值”.有鉴于此,不少教师在教学中理解为“游标卡尺的读数不需要估读,测量结果没有估读位.”笔者以为,此处有以下值得商榷之处:1)教材对例子中关于“游标卡尺读到毫米下一位的读数是准确值”的表述不够准确.2)教师对“游标卡尺的读数不需估读”的说法不符合事实.2问题讨论 1 Problem Proposed Senior High School physics education edition “Elective 3-1” on page 105 An example of readings on vernier caliper is as follows (figure 1). The measured length is l=30 mm-7 x 0.9 mm=23.7 mm. The textbook is shaded in blue. The box points out: “You can also read one millimeter or less using a common scale, but that is estimated reading. The readings obtained with this vernier caliper are accurate values.” In light of this, many teachers understand in teaching that “The vernier calipers do not need to be read, the measurement results do not have a reading position.” The author thinks that here are some of the following questions worthy of discussion: 1) The textbook reads the millimeter next reading on the vernier caliper in the example. The expression of the exact value “” is not accurate enough. 2) The teacher’s statement that “the reading of the vernier caliper does not need to be read” does not conform to the facts. 2 Question Discussion