单项选择题
A.0.1～0.3 B.0.4～0.6 C.0.7～0.9 D.1～1.5
A.8-11% B.9-11% C.8-10% D.9-12%
A.8% B.12% C.10% D.15%
A.30～40 B.40～60 C.60～80 D.80～120
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