如图所示,两个带等量正电荷的小球A、B(可视为点电荷),被固定在光滑绝缘的水平面

题型:选择题

问题:

如图所示,两个带等量正电荷的小球A、B(可视为点电荷),被固定在光滑绝缘的水平面上。P、N是小球A、B的连线的水平中垂线,且PO=ON。现将一个电荷量很小的带负电的小球C(可视为质点),由P点静止释放,在小球C向N点运动的过程中,下列关于小球C的速度图象中,可能正确的是(  )

 

考点:等势面电场线
题型:选择题

()朝代(或时期)形成“一文一事”的公文制度.

A.西周

B.春秋战国

C.秦汉

D.隋唐

E.宋代

题型:选择题

Perhaps you will visit New York one day. You might be a student there. Here is some advice.

Get a good map of the city. It will also have subway and bus maps. Remember the directions—uptown, downtown, east and west. Feel the excitement of New York .Have fun!

NEW YORK CONVENTION AND VISITORS BUREAU

Address:90 East 42nd Street,N.Y.100017

Telephone:6871300

TIMES SQUARE INFORMATION CENTER

Address:43rd Street between Seventh Avenue and Broadway

Telephone:5938983

TRAVELERS' AID SOCIETY

Address:204 ast 39th Street,N.Y.10016(central office)

Telephone:6790200

TRAVEL INFORMATION:NEW YORK SUBWAYS AND BUSES

Telephone:3301234

OTHER TELEPHONE NUMBERS

The weather:WE 61212.The time:ME 71212

Emergency (Police,Fire,or Ambulance):911 or “0” for operator

A doctor:8971000

USEFUL BOOK

Seeing New York; The official MTA Travel Guide,published by the Metropolitan Transportation Authority.

小题1:What would be the best title for the passage?

A.Introductions and directions

B.This is New York

C.Information and advice

D.Have fun here小题2:If you lose your passport in New York, you may probably get help from _______.

A.CONVENTION AND VISITORS BUREAU

B.TIMES SQUARE INFORMATION CENTER

C.USEFUL BOOK

D.TRAVEL INFORMATION小题3: If a visitor wanted to take a train, he could get some help by dialing the number “_______”.

A.8971000

B.3301234

C.WE 61212

D.911 or “0” 

题型:选择题

活性污泥的组成不包括()。

A. 微生物

B. 泥沙

C.有机污染物

D.噬菌体

题型:选择题

旅游鞋外底与外中底粘合强度测试时,发泡材料撕裂而粘合层不开时,粘合强度≥()

A.15N/cm

B.20N/cm

C.25N/cm

D.30N/cm

题型:选择题

()是指任何人只要借助互联网,就可以随时上自己喜欢的网站,浏览各种各样的信息,查阅并下载自己所需要的资料,丰富自己的知识和思想。

A.网络信息访问权

B.网络信息发布权

C.知识产权

D.文化多样性权利

更多题库