单项选择题
A.10%～15% B.30%～35% C.50%～55% D.70%～75% E.90%～95%
A.150mmHg B.130mmHg C.110mmHg D.100mmHg E.80mmHg
A.脑 B.心 C.肝 D.肾 E.四肢
A.2% B.4% C.7% D.15% E.20%
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