患者,女性,57岁。肺心病史l0年。近5d来咳嗽、气促加重。查体示肺气肿体征。动脉血气:pH 7.30,PaCO250mmHg,PaO260mmHg,给患者吸氧的正确方式是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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