Draw a line perpendicular from a curve
垂直于曲线画一条线
Draw a line perpendicular to two curves
垂直于两条曲线画一条线
Three Perpendicular Line Theorem In Space Analytic Geometry
空间解析几何中的三垂线定理
Installation of inverse perpendicular line and deviation analysis
管口悬吊定位法安装倒垂线与偏差分析
The line of sight must be approximately perpendicular to the horizontal axis.
视线必须近似地垂直于水平轴。
At each crossing of an equipotential and a field line, the two are perpendicular.
在等位面与电力线的每个交点，两者是垂直的。
These will be perpendicular to the crosspieces, and parallel to the line of the posts.
这将垂直于横担、平行线的岗位。
the angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction.
在一个入射点一条折射线与垂直于表面的线之间的夹角。
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