单项选择题
A.0.1% B.0.15% C.0.2% D.0.5%
A.0.2% B.0.3% C.0.5 % D.1.0 %
A.0.5%以下 B.1.0%以下 C.0.5~3% D.3~ 5%
A.80% B.85% C.90% D.95%
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