单项选择题
A.28.0 B.12.0 C.14.0 D.15.0
A.33.0 B.30.0 C.40.0 D.50.0
A.5000.0 B.4000.0 C.3000.0 D.2000.0
A.12.0 B.14.0 C.15.0 D.17.0
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