The regularity of random error of trace element analysis is discussed. 本文討論了痕量元素分析中隨機誤差的規律性。
Finite element method is used to calculate the strain of these materials which can be used as a criterion to avoid PCB breaking down. 透過有限元素分析能夠計算各材料應變，以及討論如何避免整體應變過大導致電路失效。
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