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. ??????? ???????????,1.?????????(??????????,????????PaO2?PaCO2??????????)???(????????????????????COPD,????,???????????,??????,?????????????????);2.???????????????????;3.?????????????;. 4.????????????????????????????????????????????????????PaO 2<8.0kPa??PaCO2 ????????;????PaCO2>6.67kPa????
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