单项选择题
A.2.0-2.4 B.2.4-2.8 C.2.8-3.2 D.3.2-3.6
A.2.5 B.10 C.16 D.25
A.30 B.60 C.90 D.180
A.2.0 B.2.2 C.2.5 D.3.5
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