line use ratio 线长使用系数
Make use of constant measure of second order curved face, and judge the space figure that arrive the fixed point and the fixed flat surface (fixed straight line) distance's ratio is a constant.
利用二次曲面的不变量判定到一定点和一定平面(定直线)的距离之比为常数的空间点的轨迹。
Considering the price-to-performance ratio, low maintenance requirements, and ease of use of the instrument, the benefit will result in bottom-line improvements for analytical laboratories.
其适宜的性价比、较低的维护需求和易于使用等优点，将从根本上改进分析实验室。
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