单项选择题
A.0.6~~0.8 B.0.9~~1.1 C.0.8~~0.9 D.1.1~~1.2
A.0.2~~0.6 B.0.6~~0.8 C.0.8~~0.9 D.1.1~~1.2
A.0.8~~0.85 B.0.85~~0.95 C.1.05~~1.15 D.1.20~~1.25
A.20~~30 B.30~~35 C.35~~45 D.45~~55
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