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【单选题】
患者，，58岁，因脑血管意外处于昏迷状态，监护示SpO286%，肺部听诊呈湿啰音。医生下达医嘱：单侧鼻导管给氧2L/min,间断吸痰。下列关于吸氧说法正确的是
A.
停用氧气时，先拔出鼻导管，再关闭总开关
B.
先插鼻导管，再调节氧流量
C.
湿化瓶内装入2/3的冷开水或蒸馏水
D.
中途改变氧流量时可直接调节，不必分开氧气管与吸氧管
E.
压力表指针降至1MPa时，即不可再用
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