Ach使窦房结细胞自律性降低是通过A.最大复极电位降低 B.阈电位水平下降 C.If 发布时间:2018-07-21 17:42 │ 来源:www.tikuol.com 题型:单项选择题 问题: Ach使窦房结细胞自律性降低是通过A.最大复极电位降低B.阈电位水平下降C.If电流增强D.膜对K+通透性增大E.Ca2+内流增强
题型:单项选择题 已知函数f(x)=1+2x,其中f(a)表示当x=a时对应的函数值,如f(1)=1+21,f(2)=1+22,f(a)=1+2a,则f(1)•f(2)•f(3)…f(100)=______. 查看答案
题型:单项选择题 The computer system suddenly while he was searching for information on the Internet. [ ]A. broke down B. broke out C. broke up D. broke in 查看答案