血容量不足时中心静脉压往往低于多少
A.5 cmH2O
B.8 cmH2O
C.10 cmH2O
D.12 cmH2O
E.14 cmH2O
参考答案:A
I like ________ in the autumn when the weather is clear and bright.
A.this
B.that
C.it
D.one
原发性高血压的心脏并发症中首先出现的是()
A.冠状动脉性心脏病
B.心绞痛
C.左心衰竭
D.左心室肥厚
E.心律失常