局麻药的作用机制是()
A.与Na结合
B.与钠通道外面的受体结合
C.与钠通道外口的受体结合
D.与钠通道内口的受体结合
E.与钠通道中间的受体结合
参考答案:D
PPP协商认证方式是通过()协议。
They were all very tired, but()of them would stop to take a rest.
A.any
B.some
C.none
D.neither