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【单选题】
,72岁。反复咳嗽、喘息20年,加重一入院。诊断为慢性肺源性心脏病,动脉血气分析示PaO 2 50mmHg、PaCO 2 55mmHg。此时病人吸氧的浓度应为A.
25%~30%
B.
35%~40%
C.
41%~45%
D.
46%~50%
E.
51%~60%
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