-What are you doing?
-I in bed. [ ]
A. am staying
B. am stay
C. are staying
D. is staying
A
男性,19岁,左侧自发性血气胸予以剖胸止血、修补肺漏气,现术后第7天,胸腔引流管已拔除,复查胸片见左胸仍有中等量胸腔积液。正确处理是
A.ASB.AIC.TOFD.PSE.MS
高峰小时内的小时交通量与()的比值,称为高峰小时系数(PHF)。
A.最小流率
B.平均流率
C.最大流率
D.年平均流率