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1、2.3直线的投影THREE PROJECTION DRAWING OF A LINETHREE PROJECTION DRAWING OF A LINEPROJECTION OF A LINEPROJECTION OF A LINEClassification of linesClassification of linesa.General-position lines(oblique lines)a.General-position lines(oblique lines)General-position linesGeneral-position linesClassification o
2、f linesClassification of linesb.Lines parallel to a principal projection planeb.Lines parallel to a principal projection planeFrontal lineClassification of linesClassification of linesc.Lines perpendicular to a principal projection planec.Lines perpendicular to a principal projection planeH-perpendicular lineThinkingThinking:How to draw the three projection drawing of a profile line?Profile line