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&ensp;&ensp;&ensp;&ensp;投影是工程制图的基本概念，工程上所用的各种图样都是用投影的方法绘制的，根据对象及目的的不同，采用不同的投影方法：中心投影法和平行投影法。要学好工程制图，就必须了解和掌握投。下面小编给大家分享正投影的特性与基本原理，希望能帮助到大家。 正投影的特性与基本原理文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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