单项选择题
A.快餐区B.收银区C.促销区
A.10mg/kgB.15mg/kgC.20mg/kgD.25mg/kg
A.10%B.13%C.15%D.18%
A.0.002g/LB.0.003g/LC.0.004g/LD.0.008g/L
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