A.高于 B.低于 C.等于 D.上述3項都行
A.3/4~4/5 B.2/3~3/4 C.1/2~2/3 D.4/5~5/6
A.0.05~0.10g/cm3 B.0.1~0.5g/cm3 C.0.15~0.20g/cm3 D.0.01~0.05g/cm3