Kèo nhà cái 5ʮָлҵҵұΪ֮ܶҵǣҽʱݵԵҪݵͯʱԶɽɽĺǵú͵ƶķdzʱͷҪһʹҪҵѧѡ˵ϵͳԶרҵʵһ·˵չгⲢʱͺϣйϴʹ˼Լֶܱ¼д̿ΪʷԶһ澵
ʮ᷿ɢȫɢߵɢ¥ݵĸܾӦɢÿ100˲С1.00mȷ۲ǰʾϸйͣˮֲ1000Ķ1.27ĶԤƻᳬ1500˷
һСӳҩûŻδȫõ˿·ȥЩPUAýرС鿯ijƣΪʲôЩǰѧѧרָ9095ǰƶɳǸԸĻ˽ĽӴ̸żIJۻʴҲγгʦΪγ̵շձϹĿIJһδ˵ڽϴĵǷɷ
ʾɫ1975УذѧϰعβμӹΰعܶӼʻԱıӪԱعܶӸܶӳ2012ɫ뿪㽭ʡܶίְ2013ɫ뾩ιԭָίθֳĿǰĽڹ˰˰25%ֵ˰˰Ϊ17%˰˰Ҫݷ˰ʴ1%~40%