A.5~9 B.2.3~3.4 C.1.8~2.2 D.3~3.36
A.1.5~1.7g/cm3 B.1.1~1.7g/cm3 C.2.1~2.7g/cm3 D.1.2~2.0g/cm3
A.4~10% B.25~40% C.>40% D.40~90%