安全状况等级为3级的压力容器，其内外部检验的周期一般是每隔（ ）年至少―次。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24907' and id < 2125059 and id<>'2125059' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24907' and id > 2125059 and id<>'2125059' order by id asc limit 5