如图（a）所示，两平行正对的金属板A、B间加有如图（b）所示

如图（a）所示，两平行正对的金属板A、B间加有如图（b）所示的交变电压，一重力可忽略不计的带正电粒子被固定在两板的正中间P处。
若在t0时刻释放该粒子，粒子会时而向A板运动，时而向B板运动，并最终打在A板上。则t0可能属于的时间段是

A. B.
C. D.

登录免费查看答案和解析

相关试题

Excuse me， do you know________？ I've just missed my train．

Yes． There is one in 10 minutes．（　　）

A．	how I can get to the train station
B．	if there's another train later
C．	when I should arrive at the train station
D．	how much a train ticket costs

收藏答案/解析

Did you notice a man passing by？

No， I________on the phone．（　　）

A．	talk	B．	am talking
C．	was talking	D．	talked

收藏答案/解析

It's impolite to ________your teachers' office without knocking at the door．（　　）

A．

describe

B．

check

C．

choose

D．

enter

收藏答案/解析

， I found the job boring， but soon I got used to it．（　　）

A．	To start with	B．	First of all
C．	Without doubt	D．	After all

收藏答案/解析

The land is rain because it hasn't rained for several months．（　　）

A．	known for	B．	useful to
C．	harmful to	D．	thirsty for

收藏答案/解析

推荐套卷

热门套卷