下列哪种脉搏提示主动脉瓣关闭不全（）。
A．交替脉
B．奇脉
C．水冲脉
D．短绌脉
E．脱落脉
参考答案：C
用括号中所给词的适当形式填空，每空一词。
1. What kind of _________ (west) food do you like best?
2. He has a cold and he feels _________ (bad) today than yesterday.
3. Please brush your _________ (tooth) three times every day.
4. You 'd better finish _________ (read) the book before the weekend.
高原红细胞增多症的诊断依据除外（）
A.红细胞增多≥6.51×1012/L，血红蛋白≥200g/L，Hct≥65%
B.血粘度比正常增高4～5倍
C.病人的臂-脑循环时间缩短
D.在高原发病
E.白细胞总数及分类改变不大
