单项选择题
A.0.5%〜0.7%B.0.8%〜1.0%C.0.05%〜0.2%D.0.01%〜0.02%
A.0.1%〜0.2%B.0.05%〜0.1%C.0.8%〜1.0%D.0.25%〜0.5%
A.2g/kgB.1g/kgC.0.5g/kgD.5g/kg
A.9g/kgB.3g/kgC.5g/kgD.7g/kg
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