单项选择题
A.0.5-1 B.1.2-1.5 C.1.6-2 D.2-2.5
A.60 B.90 C.120 D.180
A.1500-1800 B.2000-2500 C.3000-3500 D.3600-4000
A.250 B.125 C.100 D.60
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