声母习得偏误是普通话早期儿童语音习得过程中一个不可避免的普遍现象。
For a single sample, the pathlength should be selected in the range that is longer than optimum pathlength if a large pathlength selection error is unavoidable.对于单个样品,当最佳光程长获取存在较大误差时,应使所选光程长落在大于最佳光程长区域;
Type curve match analysis is the main method of modern well test interpretation, but the error of this method is unavoidable because of the limitation of the type curves in a sample plot.图版拟合是现代试井分析的主要方法,由于图版上典型曲线分辨率的限制,使得典型曲线图版拟合分析不可避免地存在误差。