单项选择题
A.20%~30% B.35%~50% C.40%~50% D.50%~60%
A.10-30 B.20-40 C.30-50 D.40-60
A.≥40% B.≥50% C.≥70% D.≥80%
A0.2 B.0.3 C.0.4 D.0.5
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