单项选择题
A.5B.10C.15D.20
A.100-250B.250-450C.450-550D.550-650
A.1300B.1350C.1400D.1450
A.2.0%-2.6%B.2.6%-3.3%C.3.5%-3.9%D.4.0%-4.5%
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