小注人情况下,还剩少数载流子扩散进入样品材料内部的平均深度称为(①)。当外界的作用撤除后,少数载流子的浓度将按(②)规律衰减,直至恢复平衡浓度。
参考答案:①扩散长度;②指数
心室肌2期复极平台期的离子机制是()
A.Na-内流
B.K+外流
C.Ca2+内流
D.Na+内流和K+外流
E.K+外流和Ca2+内流
Which of the following statements best summarizes the main idea of passage
Which of the following is mentioned as a fossil fuel
A.Petroleum.B.Natural gas.C.Wood.D.Coal.