【正文】 。如今，幾乎全部的CAD軟件都運用于普通用途的計算機。s sketch take placing changing, therefore at drawing the sketch before returning the beard make suring the guaranteeing the sketch to output our want the literalness size, should when the text word establish usage following formula: The text word draws the high degree the = the text word output high degree* the sketch to output the parison。s order: Overall situation line type parison factor tie department exportation ratio for line type ratio factor, used foring the control not continuous line type. The Ltscale is right to have the object validity, Celtscale the province for to new object validating, twoly changing the deal worth all for 1.For use the line type that Auto CAD2002 painting, big part contain three kinds of forms,( such as: Comparison that Center, Center2, Center*2, Dashed, Dashed2, Dashed*2) the first is a half, the third line type for the standard form, the second line type that parison that the first line type is the first line type of two times, if line type the parison establish to is not suitable for, and would then make some exportation diagrams the line( such as the point lineation, dotted line...etc.) change into a solid line.Two, line breadth the count of establishPass by what handicraft painting, its painting with outs the diagram is a synchronous proceeding of, now calculator painting, its painting with outs the diagram divide a step proceeds. Wether draw the construction engineering diagram or machine spare parts diagram, at print control that a work that exportation engineering drawing, the most is a line to print the drawing the breadth, line the type, color, seal a line breadth for, and eachly growing to line type all contain its cowgirl, in the AutoCAD painting process of the old edition, even defined the line type the width, its at see the diagram area can39。t attain the request of the diagram paper, will adopt some techniqueiques to modify the related system to change to measure, and can make the calculator draw to attain the request of the diagram paper with output39。 However, using a mouse to trace a curve is not an easy task.There are three basic approaches to input an existing drawing。 thus, they need more powerful puters. Systems that integrate engineering analysis or simulation packages generally are more putationintensive. A powerful puter not only speeds up the response of a CAD system, but also can support multiple users without significant performance degradation. Several other parameters and ponents concerning the puter also have to be considered.CAD HARDWARErandomaccess memory (RAM)capacity permanent diskstorage capacity special graphics accelerator tape backups RAM is the actual physical memory (vs. virtual memory)of a puter. A small memory capacity means slow processing due to frequent swapping between the physical memory and the virtual memory on disk. Because CAD is extremely storage demanding, disk capacity is important. Small disk capacity limits the system to the storage of only a few drawings. CAD is graphicsbased and requires tremendous data processing. A graphics accelerator can drastically increase the performance of the system. Another ponent, the hard disk, is typically the major cost of a puter system. Therefore, it is not costjustifiable to store all drawings on line on disk. Magnetic tape is still the most economical medium to use for offline data storage. It is necessary for a CAD system to have a tape backup subsystem.Currently, all levels of puters are used in CAD systems. Personal puters are used in lowcost,2D drafting applications, and with the new