A.90%-110% B.75%-125% C.50%-150% D.95%-105%
A.40 B.45 C.50 D.60
A.正己烷 B.2+3(v/v)二氯甲烷/正己烷 C.1+1(v/v)二氯甲烷/正己烷 D.二氯甲烷