Approximate formula is given to help the user to choose the right area of element or to see that the divided area of element meets the precision requirements.
并给出一近似公式。以便使用者选择恰当的单元面积，或检查已划分好的单元面积是否能满足精度要求。
Approximate formula is given to help the user to choose the right area of element or to see that the divided area of element meets the precision requirements.
并给出一近似公式。以便使用者选择恰当的单元面积，或检查已划分好的单元面积是否能满足精度要求。
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