单项选择题
A.0.5 B.0.75 C.1.0 D.1.2
A.0.5 B.0.75 C.1.0 D.1.2
A.960 B.1500 C.2000 D.2900
A.1.1~1.2 B.1.2~1.3 C.1.2~1.5 D.1.5~2.0
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