单项选择题
A.≤6.0% B.≤8.0% C.≤10.0% D.≤12.0%
A.≤150g B.≤160g C.≤170g D.≤180g
A.30%，70% B.70%，30% C.20%，80% D.80%，20%
A.0.01% B.0.1% C.1% D.2%
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