某交变电压的瞬时值表达式为,求此交变电压的周期和峰值。
解:据u=Umsinωt知ω=100π rad/s,,所以周期
_____ those who lived in the slums(贫民窟), chidren here are really compared to flowers, living a happy
and comfortable life.[ ]
A. Comparing with
B. Compared with
C. Comparing to
D. Compare to
动作电位产生过程中,K+外流增大出现()
A.极化
B.去极化
C.复极化
D.超极化
E.反极化