document.writeln("<Center><div class=\"doc\"><a href=\'/e/member/fava/add/?classid=47&id=41170\'  target=\'_self\'><i class=\"fa fa-file-word-o\"></i> 秸秆生物炭还田对冻融期土壤有效磷的影响及机理论文文档下载.doc </a></div></Center>");