2.等质量的聚合物A和聚合物B共混,计算共混物的Mn和M-|||-聚合物A: overline (M)_(n)=35,000, overline (M)_(w)=90,000;-|||-聚合物B: overline (M)_(n)=15,000, overline (M)_(w)=300,000-|||-__-|||-Mn=-2m=21000-|||-MnA MnB