通常情况下，用到的下列反应试剂所发生的反应，能使反应物碳链缩短的是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21887' and id < 1913406 and id<>'1913406' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21887' and id > 1913406 and id<>'1913406' order by id asc limit 5