如图所示，AD丄BC，CE丄AB，垂足为D、 E，CE、AD 交于H，AE=4,EH=EB=3，则 CH 长为：  

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31556' and id < 2528152 and id<>'2528152' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31556' and id > 2528152 and id<>'2528152' order by id asc limit 5