A.15:7,2:1 B.15:7,1:2 C.8:7,2:1 D.8:7,1:2
A.111克/摩 B.105克/摩 C.100克/摩 D.55克/摩
A.16m/n B.32m/n C.16m/nmol-1 D.32m/nmol-1