【正文】 eeps the screen from the top to the bottom line by line. Because the dot is lit for only a very short period of time, the sweep must be done very quickly in order not to have a flickering image. The refresh rate is a measure of how many times the monitor is redrawn in one second. 攀枝花學(xué)院本科畢業(yè)設(shè)計（論文） 外語文翻譯 3 The puter does not draw directly on the monitor. Connecting the puter to the monitor is usually a RGB(red, green, blue)cable. Three separate signal lines are connected. On the graphics board in the puter are circuits to generate the analog signals required to drive the monitor. There is also a frame buffer that serves as memory to store the image. Each pixel on the screen has a corresponding address in the frame buffer. The data in the frame buffer are converted into the appropriate analog signal and sent to the monitor at the refresh rate. Separately, the puter writes directly to the frame buffer the image it intends to draw. The greater the display size and number of colors, the more frame buffer is needed. The frame buffer on the graphics board is made of randomaccess memory(RAM). The calculator lend support toes to paint the software AutoCAD to make us can be with the sketch that the astonishing speed draw the engineering sketch or machine sketch and other with accuracy to sophisticate. The calculator paints to paint the different place, one of them with handicraft the paintings with out the diagram divide a step proceed of, because of but would sometimes appear the traditional handicraft the painting hour the problem of the impossible emergence. General circumstance bottom, usage the AutoCAD proceeds painting, control the precision painting and not that difficult, but want accurate then need the certain technique out the diagram. Us ually paint or outsing diagram to have no to need to change to measure to AutoCAD system worth make the modification with establish, take its the province worth can normal work, but have the special request, must modify the related system to change measure。s way of doing the antinomy, and be to adopt the to make the diagram method to can39。s sketch. AutoCAD line type establishing of parison At teaching of process inside would usually run into what this kind of circumstance, while establishing diagram layer, clearly established the point lin eationed, and consequently output to however investigate its reason for the solid lined, and is usually because of the line typed the establishing of parison is not appropriate and cau sable. Should you so establish the parison of what kind of line type? How to use the line type the parison in the painting? Usage AutoCAD painting, besides continuous line type( Continuous), the other line type is all from the solid line segment, blank segment, point series for or text this constituting. Online type definition document the inside have already defined these line types the segment39。s line type would match the engineering graphics to will pass the changes line type parison the system the method that change the deal, enlarge or 攀枝花學(xué)院本科畢業(yè)設(shè)計（論文） 外語文翻譯 4 contract all line types each a small segment of length, make the sketch made meet the request. In the Auto CAD, imply the adjustment line type the parison39。t also display the line type the width39。s line versions inside print to establish and can is divided into three part, and for printing machine belong to the sex to establish, print the style to establish respectively and the page establish. Because of the model of breadth line the space is different from diagram manifestation of space paper result, in the model space therefore the elephant vegetable