3) double-arc optimise
双圆弧优化
4) most dangerous circle
最危险圆弧
1.
According to the locus of center point of the most dangerous circle in slope solved by computer, this paper raises a simply handy method of searching the center point of the most dangerous circle in slope.
以计算机求得的土质边坡最危险圆弧的圆心轨迹为依据，提出一种手算寻求最危险圆弧的简化方法。
5) optimum precision circle
精度最优圆
1.
According to the relationship between station position and optimum precision circle, this paper researches the variant law of surveying precision of height difference when the station is chosen at different places and points out the method of selecting station position.
文章根据测站的位置与精度最优圆的相互关系,研究了当测站选择在不同位置进行观测时高差测量精度的变化规律,指出了测站位置的选择方法。
6) electric ARC optimization
电弧炉最优化
补充资料：优弧
1.数学名词。大于半圆的弧。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条