单项选择题
A.20 B.15 C.10 D.25
A.GB/T3405-1989 B.GB/T3405-2011 C.GB/T3405-1986 D.GB/T3405-2014
A.0.01gBr/100g B.0.1gBr/100g C.1gBr/100g D.整数