The greatest height of footwall cutting is determined through the theoretical analysis of cut-off grade method and breakeven point method.

通过对边界品位法及盈亏平衡法的理论分析，确定下盘最大切岩高度。

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The cube formed after cutting one part off the same planar graph in different ways of motion and its method of calculation are introduced.

介绍了同一平面图形按不同方式运动截取一部分形成的立方体的图形及计算方法。

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The lead wire parts multi-position progressive die is introduced, the method of multi-units strip material cutting off is stated, and a novel guide pin structure is introduced.

介绍了引线角多工位级进模，叙述了多单元条料的切断方法，及以一种新颖的导料钉结构。

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