将提取的胡萝卜素粗品通过纸层析法进行鉴定时，所用的层析液是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20921' and id < 1822915 and id<>'1822915' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20921' and id > 1822915 and id<>'1822915' order by id asc limit 5