神经细胞动作电位上升支的产生是（）
A.K+内流
B.K+外流
C.Na+内流
D.Na+外流
E.Cl-内流
参考答案：C
The manager promised to keep me_______ how our business was going on.
A．informing of
B．informed of
C．to inform of
D．on informing
传染病有各种临床类型，根据病情严重程度可分为普通型和非典型。
