A.i=d1/d2B.i=n1/n1C.i=z2/z1D.i=z1/z2
A.偶數(shù)B.奇數(shù)C.能整除鏈節(jié)數(shù)的數(shù)D.不能整除鏈節(jié)數(shù)的數(shù)