For a conic section, the pole of a line is the intersection of the tangents to the conic at the points of intersection of the conic with the line. For a quadric surface, the pole of a plane is the vertex of the cone which is tangent to the surface along the curve where the plane...
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Meanwhile, we have other traffic products, such as traffic cone, delineator, delineator post, convex mirror, guardrail board, beads reflective panel, reflective films, traffic light, warning board, traffic paint, etc. We always put quality first, customer supreme, the...
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