By means of the multiple-planes orthographic projection of multidimensional space, both the graphic method and graphics of the mixture problems have been given.

用多维空间的多面正投影方式，给出物料混合问题的图示、图解计算方法。

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In the north-west, the West Nile Liberation Front, a mixture of discontented Ugandans and Congolese plus Rwandan Hutus, is causing problems.

ECONOMIST: The Hutu-Tutsi divide: Spreading poison in the Great Lakes | The