A device and method for preparing compound nano fiber endless tow, which contains feeding material liquid to pair of electric spinning nozzle on frame, each nozzle respectively applied with high dc voltage with opposite polarity, each pair of nozzle jetting out nano fiber with opposite electric charge, said nano fiber attracting and colliding each other to form compound nano fiber, then forming nano fiber endless tow after drawing and stretching, the first opposite set pair of electric spinning nozzle jetted compound nano fiber endless tow is stretched down and used as acceptor which covered by the nano fiber jetted by second pair of nozzle an d forming two layers of compound nano fiber endless tow after drawing and stretching, in turn to get multilayer compound nano fiber endless tow after drawing and stretching by godet roller.

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The import picture feature is useful for displaying graphics from other applications in your drawing. For example, a cross-section drawing could be imported as a DXF file from AutoCAD for use as a background graphic while defining the problem domain. This feature can also be used to display things like photographs or a company logo on the drawing. Pictures are imported as an AutoCAD DXF file, a Windows bitmap file, an enhanced metafile, or a Windows metafile,.

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The recognition method of circuit drawing plotted by AutoCAD is proposed It uses the topological graph to describe the electrical symbol s drawing and adopts the isomorphic graph algorithm to recognize the electrical symbols, meanwhile,the circuit wires are also recognized It can recognize the circuit drawing automatically with high accurac

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In traditional 2D design process, designer converts his ideas to 2D drawing then forming assembly drawing and parts drawing. The designer's thought works between 3D ideas and lines of plane projection.

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The classical cutting stock algorithm——column generation technology , and wrap up rectangle technology for abnormity are analyzed ; The development of AutoCAD with ObjectARX is studied and the generating method of cutting outline drawing and layout drawing were found out on the basis of analyses of the graph database structure of AutoCAD and the basic operation of it ; The process planning technology of plate material cutting orienting numerical control is studied a process planning method directly based on layout drawing is established ; The emulation technology in AutoCAD is studied and a kind of dynamic emulation method is put forward , which is realized by incrementally modifying graph entity ; The postposition of NC program of the integrated cutting system constructed on software plug-in is proposed , which can effectively solve the problem that it is difficult for a numerical control programming system to be common , which is caused by the difference of instruction format and control parameter between different type of numerical control machine .

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Qi Baishi is one of the most famous Chinese artists who enjoys world reputation. During the one-century art career, with the unyielding resoluteness and enterprising spirit Qi Baishi unceasingly studied the drawing art, eventually he succeeded in setting up one kind of drawing style, opened a new epoch of Chinese drawing art, devoted valuable spiritual wealth to mankind.

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The paper uses Fortran language to compile the subroutine wich is similar to the window and view sentence in BASICA,and rewrites the drawing point and line subroutine with the assembled subroutine of drawing line in the reference one,thus FORTRAN drawing is not limited by the actual border of the screen and is able to enlarge,reduce and cut the graph.

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Draw the effective composition of the red red-spotted stonecrop through drawing the law in ultrasonic wave at first, learn through the experiment that drawing time , density , firm liquid in supersound will have remarkable influence than on the drawing rate of supersound; 60% ethanol solution of solution, than remarkable ultrasonic reciprocation of time firm liquid have; The best experiment condition is: Solvent solution, firm liquid than for 1:10, draw 45min for 60% ethanol..

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