单项选择题
A.0.2%B.0.3%C.0.4%D.0.5%
A.1000B.900C.800D.700
A.0.02%〜0.07%B.0.07%〜0.20%C.0.20%〜0.35%D.0.35%〜0.70%
A.0.10%-0.25%B.0.15%-0.20%C.0.20%-0.35%D.0.35%-0.40%
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