患者男性,患肺炎合并脑病,肺部听诊有痰鸣音,给予持续氧气、雾化吸入,巡视病房时发现患者出现呼吸困难、发绀,这时应采取的措施是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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