下列哪一项是老年人高血压的特征
A.血压波动大,易出现直立性低血压
B.持续性收缩压、舒张压增高
C.不易出现直立性低血压
D.顽固性头痛
E.舒张压持续在高水平
参考答案:A
we’ll go to the Great Wall___ there is heavy rain tomorrow.
OK! Walking on the Great Wall must be great fun.
A.as soon as
B.when
C.unless
D.if
脊髓前角受压可出现()
A.肌张力增高
B.肌萎缩
C.腱反射亢进
D.病理征阳性
E.痉挛性瘫痪