document.write("<div class='udPage'><img src='/image/title.gif' width='8' height='9' />&nbsp;&nbsp;<b>上一篇：</b><a href='/articledetail.asp?article_id=77'>正确认识编码器的精度和分辨率</a></div><div class='udPage'><img src='/image/title.gif' width='8' height='9' />&nbsp;&nbsp;<b>下一篇：</b><a href='/articledetail.asp?article_id=68'>编码器的工作原理及作用</a></div>")