The regularity of random error of trace element analysis is discussed. 本文讨论了痕量元素分析中随机误差的规律性。
Finite element method is used to calculate the strain of these materials which can be used as a criterion to avoid PCB breaking down. 透过有限元素分析能够计算各材料应变，以及讨论如何避免整体应变过大导致电路失效。
