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λĹȦ൱ĺĤ Ȧúܴ󣬾ͻдĹ߽ӰӦ;෴أȦڱպϵ״̬ôͻԼСܶࡣ Ȧֵһֵ()ʾΪ12.815.6ʽ ȦֵijʼֵΪ1(2021/2)һȦֵ1(2121/2)ƣ˳Ϊ1(2n-121/2) йȦֵǰĹɼóģÿһȦȼĽһȦֵһ롣 ǿf/2.8F2.8ʽʾȦֵ漰ĹȦΧһF2.8F32



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