缺铁性贫血早期最可靠的实验室检查是()
A.血清铁蛋白降低
B.红细胞内原卟啉升高
C.血清铁减少
D.运铁蛋白饱和度降低
E.血清总铁结合力增高
参考答案:A
—Where would you like to go on your summer holiday, Mike?
—I'd like to go [ ]
A. nowhere interesting
B. interesting anywhere
C. somewhere interesting
D. interesting somewhere
慢性肺心病引起肺动脉高压最主要的原因是()。
A.血液粘稠度增加
B.血容量增加
C.慢性炎症所致的肺动脉狭窄
D.高碳酸血症
E.缺氧性肺血管收缩