根据《安全生产许可证条例》，安全生产许可证的有效期为（）年。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id < 2121298 and id<>'2121298' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id > 2121298 and id<>'2121298' order by id asc limit 5