单项选择题
A.氯化钡 B.铬酸钡 C.硝酸钡 D.乙酸钡
A.≤0.05% B.≤0.1% C.≤0.2% D.≤0.5%
A.≤1g/100g B.≤2g/100g C.≤5g/100g D.≤10g/100g
A.硫酸镁 B.硫酸钾 C.硫酸锌 D.硫酸钡
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