document.write ("<b>上一篇</b>：<a href='/DocHtml/699/2014/6/11/2009748134671.html'>化学方程式的书写与应用</a><br><b>下一篇</b>：<a href='/DocHtml/699/2014/6/3/9329526634669.html'>常见的化学反应—燃烧</a>")