I work all the day. I’m very ________. [ ]
A. happy
B. sorry
C. tired
D. sad
答案:C
等渗性缺水的常见病因为()
A.急性肠梗阻
B.肺炎高热
C.腹膜炎
D.十二指肠瘘
E.食管癌吞咽困难
我国把精细化工产品分为11类。