发热最常见的病因为
A.变态反应
B.内分泌代谢障碍
C.感染性疾病
D.无菌性坏死组织吸收
E.体温调节中枢功能失调
参考答案:C
2岁时小儿的HbF为()
A.<0.3
B.<0.02
C.<0.1
D.<0.05
E.<0.5
Discuss the main duties of an agent towards his principal. (10 marks)