单项选择题
A.85% B.80% C.75% D.70%
A.150~180 B.200~250 C.300~400 D.400~500
A.0.3~0.6 B.0.6~0.9 C.1.0~1.5 D.1.5~2.0
A.0.10~0.20 B.0.15~0.25 C.0.25~0.30 D.0.30~0.35
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