In engineering and product design, computer can help designers to take charge of calculation, information storage and drawing. In the process of design, a lot of calculation, analysis and comparison of different schemes are usually carried out by computer to determine the optimal scheme; all kinds of design information, whether digital, literal or graphic, can be stored in the memory or external memory of the computer, and can be retrieved quickly. CAD has been widely used in architectural design, scientific research, mechanical design, software development, clothing industry, civil engineering, geology, computer art and other fields.<br>
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