document.write ("<b>上一篇</b>：<a href='/DocHtml/1039/2014/12/29/7776197128436.html'>3.3 探究平面镜成像特点</a><br><b>下一篇</b>：<a href='/DocHtml/1039/2014/12/29/7570890128434.html'>2099小红帽</a>")