The concepts of complementary cofactor pairs, normal double-graphs and feasible torn vertex sets are introduced.
引入了互补余因式对、正规双图和可行撕裂点集的概念。
Moreover, the extreme shape of the normal double circle gearing proves to be the involved curve of the corresponding ellipse.
并且证明，法面双圆弧齿轮的每一段端面齿廓都是对应椭圆曲线段在相对运动中的包络曲线。
Normal, double-helix DNA is spiral , like a loosely coiled spring.
正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。
Normal, double-helix DNA is spiral , like a loosely coiled spring.
正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。
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