A.0.1-0.2g/cm3 B.0.2-0.3g/cm3 C.0.3-0.4g/cm3 D.0.1g/cm3
A.1 B.2 C.3 D.6
A.0.5-3 B.0.5-2 C.2.5-3 D.2.5-5