基本解释：非零向量
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Using the convex cone theory of nonlinear functional analysis, thesufficient condition is obtained in which the system has at least two non-trival w-periodicsolutions.点定理讨论了ｎ维非自治系统，给出了该系统存在两个非零周期解的充分条件。
This keypoint of this paper is:The new type of the non-zero modification bevel spi rals are used in bicycle design to get more lifespan and efficiency.文中介绍的创新点为:用新型非零变位弧齿锥齿轮取代传统的零变位弧齿锥齿轮,以获得更高的使用寿命和传动效率;引入Ansys结构受力分析手段和Pro/engineer参数化实体造型设计,方便快捷地达到设计意图。
Being directed against elliptical gear drive a kind of non-zero modification method has been advanced.针对椭圆齿轮传动提出了一种非零变位的方法。
