单项选择题
A.大于0.2g/100g B.小于0.2g/100g C.等于0.2g/100g D.小于等于0.2g/100g
A.10 B.2～4 C.5 D.4～6
A.60～70% B.30～80％ C.大于80％ D.小于30％
A.10% B.20% C.3%～5% D.15%
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