单项选择题
A.50-100 B.100-200 C.200-250 D.250-350
A.70% B.60% C.50% D.40%
A.0 B.8 C.16 D.22
A.0.5-1.59 B.1.87-2.23 C.2.5-3.5 D.4.5-5.0
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