A.>3%且≤20% B.>5%且≤15% C.>5%且≤20% D.>3%且≤15%
A.0.01g/cm3 B.0.02g/cm3 C.0.05g/cm3 D.0.1g/cm3
A.1g B.0.1g C.0.01g D.0.001g