在一般实验所得的数据中,常要受到试验误差的影响,致在所得数值间存在有或大或小的偏离,这一现象我们已经知道主要是由可测的(系统)与难测的(随机)两类误差造成的。前者出现比较稳定,因此可用估计或校正的方法来消除;但后者系由多种可变的或一些难以估计的因素所致,故不能完全避免。对分析工作者来说,最重要的是如何尽可能知道这些误差来源 In the data obtained from the general experiment, it is always subject to the influence of the test error, so that there is a large or small deviation between the obtained values. This phenomenon, which we already know, mainly consists of measurable (systematic) and unpredictable Random) caused by two types of errors. The former appears relatively stable and can therefore be eliminated by means of estimation or correction; however, the latter is caused by a number of variable or some unmeasurable factors and can not be completely avoided. The most important thing for analysts is how to get to the sources of these errors as much as possible