document.write ("<b>上一篇</b>：<a href='/DocHtml/699/2016/6/16/7266156834676.html'>动物世界里的“化学战”</a><br><b>下一篇</b>：<a href='/DocHtml/699/2016/5/30/9921964334668.html'>在物理教学中减轻学生负担尝试</a>")