单项选择题
A.20kg/桶 B.18kg/桶 C.15kg/桶 D.10kg/桶
A.1:3.5 B.1:2.8 C.1:1.8 D.1:1.5
A.JC/T984-2017 B.JC/T907-2018 C.JC/T2090-2017 D.JC/T547-2017