反映小气道病变最敏感的指标是()
A.最大自主通气量
B.每分通气量
C.通气储备百分比
D.流速-容积曲线
E.功能残气量
参考答案:D
After the hero's story ____ on CCTV , many people are learning from him.[ ]
A. reports
B. reported
C. was reporting
D. was reported
任何一方供应的材料、设备和半成品都必须按设计文件要求和国家规定的技术标准,并应附()
A、出厂合格证
B、质保书
C、化验单
D、产品标签