关于周期性麻痹,下列哪项不对().
A.原因常不明
B.无肌张力增高
C.发作后可自行缓解
D.发作时血钾高
E.反射减弱
参考答案:D
Great changes ______ in the past few years, and a lot of factories ________.
A.had taken place; have been set up
B.have taken place; have been set up
C.took place; have set up
D.were taken place; were set up
系统发生振荡时,应争取在()分钟内消除振荡,否则应在适当地点解列。
A、1~2
B、3~4
C、5~8
D、10