Kèo nhà cái 5ͬ칵Ϫ20ҷʾ֮һΪõĻȾô彨ɼҷѵĻǽĻȵҷΪġǡÿڼô˻̽ĻпչҷôȺھΪСʧڡϱ֦10ҷ㷺ԱɲȺǼҷ̵ذ滹ڲƷȫԷտҪչҩƷ鹤ҩƷٴҩľΪҪҪ֪ͨڹ涨ʱлίмٴƷ鱨;ҩľΪ֪ͨչ鹤2017121ǰҩƷٴҩľΪ֪ͨؼֹ鲢Ϲ涨ļ۵ҩIJٴ
й֮ݺᡷȥ꿪ʼΪвȫ20зų˲ŵĸе仧ΪΪĵ֮һԴԭԡĺͺҲסǰͺطˡͺƽ˲ȷչսԵɴʩ()ʩȷͨȫרϵıҵż仧ͺ
λ᳤СԭϯŮС1975꿪ʼйѺЭṤڼǰݴѧɼУѧϰʷѧ˶ʿѧλ1983طЭְ2011йѺЭ᳤˰=(˰۸+ڹ˰)(1-˰˰)˰˰
1949֮ǰлһθͳ1949̨һ1310λ쵼ʯĸ쵼йλ֣³ϼ;ӽйλ֣лǻ;ǻλ֣Ԫս;ˮһλ֣;Ӣλ֣ͲӢĴӵdz½DZҪƳڹֻӷľ˼·ȥûбҪļӰǿԹԤԺͳЭѧļӰ˵ԼʱعҸ