单项选择题
A.15000 B.12000 C.10000 D.9000
A.80 B.100 C.120 D.170
A.0.4~0.5 B.0.6~0.8 C.0.85~0.90 D.0.9~1.2
A.0.4~0.5 B.0.6~0.8 C.0.8~0.9 D.0.9~1.2
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