单项选择题
A.20×109 /L B.30×109 /L C.40×109 /L D.50×109 /L E.60×109 /L
A.≥15% B.≥25% C.≥35% D.≥45% E.≥55%
A.55% B.65% C.75% D.85% E.95%
A.40% B.50% C.60% D.70% E.80%
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