Thick solid line, thin solid line, wavy line, double broken line, dashed line, thin dashed line, thick dashed line and double dashed line, the code names are A, B, C, D, F, G, J and K in turn.

CAD is the abbreviation of Computer Aided Design. It is a popular auxiliary drawing software system in China, which is widely used in many fields such as civil construction, decoration, urban planning, landscape design, electronic circuit, mechanical design, clothing, shoes and hats, aerospace, light industry and chemical industry.

CAD belongs to drawing software, which can draw complex engineering drawings instead of simple lines or icons, and its drawing function is very powerful. Therefore, if you draw mechanical drawings, architectural drawings, electrical drawings, etc., generally choose CAD. There are three kinds of drawings drawn by CAD, namely plan, axonometric and stereoscopic.