单项选择题
A.100~120 B.120~180 C.180~230 D.250~300
A.1.2 B.1.31 C.1.42 D.1.52
A.50~55% B.55~60% C.60~70% D.70~75%
A.2~30% B.3.4~60% C.4.3~40% D.4.3~46%
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