单项选择题
A.≥30% B.≥40% C.≥50% D.≥80%
A.40% B.50% C.60% D.70%
A.30%～40% B.50% C.40%～60% D.50%～70%
A.ⅠB B.ⅠC C.ⅡA D.ⅡB
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