在中学物理实验中,学生对电学仪表量程选用的判断方法一般是预先估计被测量值,使被测量值不能超过量程,或用“试触法”来判断被测量值是否超过量程.这些确定量程的方法引起的直接后果是:部分学生在实验时为了不损坏仪器都选用最大量程,从而忽视了被测量值的精确度,给实验带来较大的误差.笔 In the middle school physics experiment, the students choose the measuring method of the electrical instrument is generally to estimate the measured value in advance, so that the measured value can not exceed the range, or use the “test method” to determine whether the measured value exceeds the range. The direct consequence of the range method is that some of the students choose the maximum range to avoid damaging the instrument during experiment, so as to neglect the accuracy of the measured value and bring a big error to the experiment.