单项选择题
A.8~10 B.18~20 C.28~30 D.30~35
A.30%~35% B.50%~60% C.70%~80% D.90%~95%
A.0.68~0.80 B.0.80~0.98 C.0.98~0.10 D.0.10~0.18
A.-10~-12 B.-15~-18 C.-20~-25 D.-30~-35
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