慢支伴小气道阻塞时,最早出现的肺功能改变是()。
A.流量-容积曲线降低
B.残气容积增加
C.闭合容量减小
D.肺最大通气量降低
E.第1秒肺活量占用力肺活量的比值减小
参考答案:A
Billy: I’ve been fixing the computer for over three hours, but it still doesn’t work.
Nana: Why don’t you take a rest and try ? Maybe you’ll do better then.
A.early
B.finally
C. later
D.Once