单项选择题
A.500000 B.0.00015 C.0.00025 D.0.00035
A.0.002 B.0.003 C.0.004 D.0.005
A.0.3 B.0.5 C.0.6 D.0.7
A.2%～72% B.3%～73% C.4%～74% D.5%～75%
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