单项选择题
A.0.1~0.3 B.0.32~0.5 C.0.5~0.7 D.0.7~0.9
A.5 B.10 C.15 D.20
A.0.1~0.2 B.0.2~0.3 C.0.3~0.4 D.0.4~0.5
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