可能计时，量距离会有误差，于是多人配合并且多次实验取平均值。
The timeamount and distance will have error, so many people should cooperateand do an experiment many times for the average.
毫克量亚钛的库仑滴定，平均误差和平均偏差约为0.2％。
Coulometric titrations of titanous ion give an average precision and accuracy of about 0.2% for milligram quantities.
年平均蒸发量相对误差小于4％。
The relative error of annual mean evaporation is less than 4%.
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