患者女性,65岁,被人用轮椅推入医院,接诊护士看见其面色发绀,呼吸困难,询问病史得知其有慢性阻塞性肺疾病史,给予吸氧流量应是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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