ɹ ɹȻйʽ!鲻һɹѧ־飬һȫͳɹĿѧֲᣬijɹɽʾ˳ɹձĿѧɡֻҪܹ뵽κˣǵijɹ֮·Щɾ
¶ ɹ ɹأйأɹһּһĻӦ Ͽɡ Ƚʾ˳ɹѧɣ ɣɹʱɹ ڶɣнģɹġ ɣʼijɹ Ӧ = δijɹ ĶɣɹŶӼ߶ƽԣһ쵼ӱ 嶨ɣɹԷκʱ䣬 ֻҪһ뷨ϼֲи ȫоȨ ޱ ˰-˹ ù½ʾɹ5ѧɣ˾ʵܸƣ ȫǡǵ֧֣㼯100λ*Ŀѧҡѧҡѧҡҵ*оɹ״νʾ
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