根据《标准施工招标文件》中通用条款规定，变更指示由（）签发。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id < 2121316 and id<>'2121316' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24809' and id > 2121316 and id<>'2121316' order by id asc limit 5