低频电疗法促进血液循环的机制不包括（）。
A.轴突反射
B.组胺的释放
C.抑制交感神经
D.即时镇痛作用
E.P物质与乙酰胆碱的释放
参考答案：D
Shirley _____ a book about China last year, but I don't know whether she has finished it.
A．has written
B．wrote
C．had written
D．was writing
婴幼儿少尿定义为：24小时尿量（）
A.<600ml
B.<400ml
C.<200ml
D.<100ml
E.<50ml
