if(document.getElementById('relative'))document.getElementById('relative').innerHTML='<div>前一篇：<a href=\"/other/chem_knowledge/show.asp?id=606497\" target=\"_self\">如何辨别油品好坏？</a></div>\n<div>后一篇：<a href=\"/other/chem_knowledge/show.asp?id=608580\" target=\"_self\">石油科普：怎么去除石油中的杂质</a></div>\n';