动作电位到达轴突末梢引起突触前膜递质释放与下列哪项有关
A.Ca2+外流
D.K+外流
C.Na+内流
D.K+内流
E.Ca2+内流
参考答案:E
Being late at a meeting is of Tom, so you should not be surprised at his today's late arrival. [ ]
A. strange
B. typical
C. unique
D. particular
以下指标中反映其它用户影响,需要在链路预算中考虑的参数是()
A.衰落裕量;
B.干扰裕量;
C.建筑物穿透损耗;
D.车体损耗;