公路或铁路路基填筑完后，因前期施工过程中导线不通视及施工误差等多种原因，会出现直线与曲线不能闭合的情况。
Upon completion of subgrade filling for railways or highways, sometimes the straight line and curved line cannot close due to errors in construction or other reasons.
本文开发以交流电源供电的两平行碳纤维导线构成的直线型传感器。
A new linear sensor consisting of two parallel carbon fibers, energized by the alternative current has been developed.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
In this paper, it is presented that the locus of a line crossedwith each of two guide lines and a guide conic not being on a commonplane is a ruled surface of fourth order.
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