神经细胞锋电位上升支的离子机制为()
A.Na+内流
B.N+a外流
C.Ca2+内流
D.K+外流
E.K+内流
参考答案:A
一根长15cm的铁丝,在不折弯的情况下,能否放入长12cm宽5cm高6cm的长方形盒内______.(填“能”或“不能”)
My father usually tells me the story of Chang'e ____the evening ____Mid-autumn Festival. [ ]
A. in. of
B. in, at
C. on ; at
D. on ;of