单项选择题
A.-0.5/0.5 B.-0.2/0.25 C.-1.5/10.5 D.-0.5/10.5
A.8 B.10 C.12 D.6
A.1.0 B.0.9 C.1.2 D.0.8
A.3 B.2 C.1 D.0
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