document.write('<div class=\"sidebar\"><a id=\"copytext\" data-clipboard-action=\"copy\" data-clipboard-target=\"#docopy\" class=\"fuzhi\"><span>一键复制</span></a><a class=\"sidedown dl-link\"   href=\"javascript:;\" id=\"vipdown\"  onclick=\"showpay(2)\"><span>下载文档</span></a><a href=\"javascript:;\" class=\"gf_tousu\" onclick=\"showkf()\"><span>联系客服</span></a></div><div class="d_alert marks" price="2.9"  redodown="1"  myuserid="0" token="f1d6f25ef7" iscopy="0"classid="535"  copyid="docopy" userid="51" payurl="/" sign="b400e4012c" ddno1="YrIA" ispc="pc" id="90509"  showid="" vip="newstext"  num="0" dotype="2"><div class="copy-alert alert-bounceIn"><div class="claos closepay"></div><div class="paybox"><div class="payitem item-active" isone="1" ggroupid="2" gfen="9" gmoney="9" gdate="30"  gmoney="9" ><span class="hot"></span><div class="paybox-title">月会员</div><div class="paybox-img" style="margin-top:15px;"><img src="/skin/fword/images/paper_more.png"></div><div class="paybox-art">每天0次下载</div><div class="paybox-money"><strong>9元/30天</strong></div></div></div><div class="paybox"><div class="payitem"  isone="0"  gmoney="2.9" ><div class="paybox-title">直接下载</div><div class="paybox-img" style="margin-top:15px;"><img src="/skin/fword/images/paper_one.png"></div><div class="paybox-art">单次下载</div><div class="paybox-money"><strong>2.9元/次</strong></div></div></div><div class="paybottom"><div class="paybox-bottom2" onclick="showcode(1)">微信支付</div><div class="paybox-bottom2 alipay paylogin2" onclick="showcode(0)">支付宝支付</div></div><div class="xiazai"><div class="xiazai-box"><a href="javascript:;" onclick="showkf()"  class="redown">联系客服</a><a href="javascript:;"  class="redown" onclick="ajaxlogin();">立即登录</a><a href="javascript:;"   class="redown" onclick="showkf()">忘记账号</a></div></div></div></div><div class="pay_mask marks"><div class="mask_box"><div class="pay_mask_top">欢迎使用微信支付</div><div class="pay_qrcode"><img class="paycode" src=""></div><div class="pay_tip"><img src="/skin/fword/images/sys.png"alt="">扫一扫支付</div><div class="pay_price">金额：<span class="paymoney"></span></div><div class="claos closecode" ></div></div></div><div class="customer_mask mask"><div class="customer_service_box"><div class="cj_title"><span>常见问题</span></div><ul><li><div class="que">1、支付成功后，为何无法复制/下载</div><div class="ans">付费后复制不了，请核对下微信账单信息，确保付费成功；已付费成功了还是复制不了<br/>VIP会员登陆即可:<a href="javascript:;" onclick="AjaxLog()">点击这里</a><br/></div></li><li><div class="que">2、忘记账号和密码的解决办法</div><div class="ans">忘记账号请：<a href="javascript:;" onclick="showfaq()">点击这里</a><br/>忘记密码请：<a href="http://wpa.qq.com/msgrd?v=3&amp;uin=1306325736&amp;site=qq&amp;menu=yes" target="_blank">点击这里</a></div></li><li><div class="que">3、如何联系客服</div><div class="ans">快速举报反馈通道：<a href="https://wendangwuyou.com/e/tool/feedback/?bid=1" target="_blank">立即【投诉-举报-反馈】</a><br/>如果以上无法解决您的问题请：<a href="http://wpa.qq.com/msgrd?v=3&amp;uin=1306325736&amp;site=qq&amp;menu=yes" target="_blank">站长QQ</a><br/>微信客服：yiqidaoshu</div></li></ul><div class="member"><script src="/e/member/AjaxLog/loginjs2.php"></script></div><div class="claos closekf" ></div></div></div><div class="down_mask mask" ><div class="down_service_box"><div class="close" data-alert="customer_mask"></div><div class="cj_title"><span>下载中心</span></div><div class="down_body"><p>您的账号注册成功！密码为：123456，当前为默认信息，请及时修改</p><p><a href="" class="down">下载文件</a><a href="">立即修改</a></p></div><div class="claos closedown"></div></div></div><div class="faq_mask mask"><div class="faq_service_box" ><div class="close"data-alert="customer_mask"></div><div class="cj_title"><span>帮助中心</span></div><div class="faq_get"><p><input class="orderid" type="text" size="30" placeholder="请在这里订单号"></p><p><a class="getuser" href="javascript:;" onclick="getusername()">找回用户名</a></p></div><div class="faq-show"></div><div class="faq-tishi"><p><b>如何获取自己的订单号？</b></p><p>打开微信，找到微信支付，找到自己的订单，就能看到自己的交易订单号了。</p><p><img src="/skin/fword/images/faq.jpg"></p></div><div class="claos closefaq" ></div></div></div>');
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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\">声速与马赫数</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp;声速是声波在可压缩流体中相对于流体的传播速度， 用a表示。 声波是一种弱扰动波，它所引起的压强扰动是极其微弱的， 压强变化具有微小的振幅dp， 相应的其他流动参数也发生微小的变化， 如密度dρ。下面小编给大家分享声速与马赫数，希望能帮助到大家。 声速与马赫数文档下载网址链接：</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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