居家的COPD病人持续给氧的时间和浓度分别是()
A.4h2-4L/min
B.8h2-4L/min
C.12h1-2L/min
D.15h1-2L/min
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正确答案: D 答案分析:无
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A.4h2-4L/min
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A.4h2-4L/min
B.8h2-4L/min
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D.15h1-2L/min