To master the law of common surface equation, not only can easily establish a space graphics, but can lay a solid basis for learning multi-function.
掌握常见的曲面方程的识记规律，不仅能轻松建立空间图形，而且为多元函数积分学的学习打下坚实的基础。
Because the objective function of the safety of factor is nonconvex, multi-variable, and existing many minimums, searching the most dangerous failure surface usually is difficult.
由于安全系数的目标函数是非凸的、多变量的并且存在多个极小值，所以一般边坡最危险滑弧的搜索是困难的。
Machine vision system is one of key parts in the multi-function surface mount equipmens.
机器视觉系统是多功能贴片机不可缺少的核心部分。
Machine vision system is one of key parts in the multi-function surface mount equipmens.
机器视觉系统是多功能贴片机不可缺少的核心部分。
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