在考虑三维有界区域的一般情况下，提出了一类分数步长特征差分格式。
For a general case of three dimensional bounded region, we put forward a kind of fractional step characteristic difference schemes.
用梭形旋转曲面包围三维有界场源，将位场的地表观测值延拓到场源之外的空间区域。
The earths surface observation is extended to the region beyond the source with a methodof sphere surrounding three-dimensional finite source.
用梭形旋转曲面包围三维有界场源，将位场的地表观测值延拓到场源之外的空间区域。
The earths surface observation is extended to the region beyond the source with a methodof sphere surrounding three-dimensional finite source.
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