浮点数表示法，含部份换轴之高斯消去法，使用矩阵大小之计算尺度调整，带状及三角对角系统，LU分解。
Floating point representation, Gaussian elimination with partial pivoting, scaling of computations with matrix size, banded and tri-diagonal systems, LU decomposition.
介绍了针刺法非织造有针刺密度的计算公式及其变换，以及计算尺的使用，以利于生产者方便应用。
The calculation and converting of the formula for punching density of needle punching nonwovens and the usage of the slide rule are introduced, to be favourable for producers to use.
推导了使用极值法、概率法计算尺寸链的补充公式。
Several complementary computing dimension chain formulas of Extremum Method and Probability Method are deduced.
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