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The ordinary matrix perturbation method fails to deal with the structural system of repeated or closed frequency modes.
当系统具有重频或近频耦合模态时，常规的矩阵摄动法失效。
In seismic inversion, the inverse matrix is mostly huge singular, the ordinary methods cannot be directly used to solve the equation, and the SVD technique must be used.
在地震波阻抗反演中，其反演矩阵多为接近奇异的大型矩阵，不能用一般方法直接求解，而要用奇异值分解(SVD)方法解方程。
By studying the application of sandwich-structured synthetic diamond core bits, following results are concluded: Matrix hardness can be HRC3-5 higher than that of similar ordinary ones;
通过对夹层结构金刚石钻头的应用研究发现，与同类普通金刚石钻头相比，该钻头的胎体配方硬度可以高HRC3~5；
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