幼儿胸部出现突起畸形。查体:胸骨体前凸,肋软骨及肋骨凹陷。可诊断为()
A.维生素D缺乏
B.胸壁结核
C.胸壁肿瘤
D.漏斗胸
E.鸡胸
参考答案:E
I’m only brave when I have to be. __________ doesn’t mean you go looking for trouble.
A.To have been brave
B.Having been brave
C.Being brave
D.Be brave
采用了助滤剂过滤介质的()。
A.孔隙度增大,阻力增大
B.孔隙度不变,阻力减小
C.孔隙度减小,阻力减小
D.孔隙度增大,阻力减小