In recent years, educational arbitrary charge becomes the social focus once again, has caused negative influence in the society.

近年来，教育乱收费再度成为社会焦点，在社会上造成了不好的影响。

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The General solutions of space-charge flow and electrode shape are given in the crossed electric and magnetic fields electrode system in which the cathode operates under arbitrary condition.

给出了在正交场中，阴极处于任意工作状态下，求空间电荷流和电极形状的普遍解。

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