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
— Would you like me to help you?
— ________ .
A.Of course not
B.No, thank you all the same
C.Well done
D.Yes, I can manage it myself
耐热温度120℃的绝缘耐热等级为()。
A、F
B、H
C、E
D、A