使用肺功能仪测定支气管扩张剂对COPD患者呼吸功能的改善,下列哪几项是评判COPD患者是否合并哮喘的测定指标()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧