A.GB/T5224-2003 B.GB/T14370-2007 C.JGJ145-2004 D.JG/T5011.8-1992
A.21% B.16% C.11% D.6%
A.0.01g/cm3 B.0.02g/cm3 C.0.03g/cm3 D.0.04g/cm3