糖类纸色谱的展开系统中常加入一定量的乙酸、吡啶或乙醇，目的在于

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26289' and id < 2199172 and id<>'2199172' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26289' and id > 2199172 and id<>'2199172' order by id asc limit 5