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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">信号传输原理</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp;目前世界上专用于非开挖铺管导向钻进的导航仪种类较多，它们的工作原理和组成部分各有区别，但按地下信号传递到地面的方式可分为有线式和无线式两大类。有线导向仪是将探测到的钻头的深度、倾角、工具面角等。下面小编给大家分享信号传输原理，希望能帮助到大家。 信号传输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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