患者男性,86岁。有COPD病史30年。平素体弱,三天前受凉后再次出现咳嗽咳痰,痰白质黏量多,伴有气急。此时患者应避免使用( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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