A.1.5% B.2.5% C.3.5% D.4.5%
A.體積要大,其濃度要高 B.體積要小,其濃度要低 C.體積要大,其濃度要低 D.體積要小,其濃度要高
A.8% B.4% C.3.9% D.7.8%