单项选择题

长期家庭氧疗的指征()

A.PaO2≤55mmHg或SaO2≤88%
B.PaO2≤45mmHg或SaO2≤88%
C.PaO2≤55mmHg或SaO2≤90%
D.PaO2≤60mmHg或SaO2≤88%
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