
                              
                               ͨϵ
             ----------------------------------------------------------
                򳵵      1          2          3         4
               ϵ    1.0      0.8-1.0    0.6-0.8    0.5-0.75     
             ----------------------------------------------------------
             ע⣺1.ݼ淶¼A  A.1.1,涨Ʋ
                     ȡֵΧΪ[0.25,1.0]ʱ,Ʋ
                     ȡֵΧڣʵѡ
                   2.ݣͨʱȡֵͨСʱȡֵ 


