           

           ڡɻ·㶥浱صģ˵

           Ŀǰҹ䴸δռ4 W ֵ޷ⶨ
       룬˳Ҫû4 W ֵֻҪû
       㶥浱صģֵûʲôⶨõ



                ڡйصָ˵

           ָ淶¼ B B.1.4 ,ΪƣӦϵ 
       Kf ʱ׼ۼô Ne ָɻ·Ϊͨ
       ֽʱ=0.057;ɻ·
       Ϊѹʱ=0.065;ɻ·Ϊά
       ʱͰʽȷ
                 
                 =0.053-0.017PfLf/Df/100
          
           ʽ: Pf--άʣ%
                 Lf--άĳȣmm
                 Df--άֱmm  
                     