单项选择题
A.0.5 B.1 C.1.5 D.2.0
A.2 B.5 C.10 D.20
A.2~5 B.3~4 C.5~7 D.4~5
A.0.05~0.1 B.0.1~0.2 C.0.2~0.3 D.0.15~0.25
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