设备安装时，螺栓的紧固应对称均匀，松紧适度，紧固后的螺栓的外露长度以（） 个螺距为宜。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24907' and id < 2125072 and id<>'2125072' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24907' and id > 2125072 and id<>'2125072' order by id asc limit 5