迷走神经兴奋时()
A.延长窦房结与周围组织不应期
B.缩短窦房结与周围组织不应期
C.减慢房室结的传导
D.抑制窦房结自律性与传导性
E.加快房室结的传导
参考答案:A, C, D
17.I don’t think he was happy although he lived in a rich family, _______?
A.wasn’t he
B.was he
C.do I
D.don’t I
存储结构的4种基本类型分别是顺序、链式、索引和______。