如图1所示,,b,c,d为四个带电小球,两球之间的作用分别为吸d,b

如图1所示,bcd为四个带电小球,两球之间的作用分别为dbccdb,则(  )

A.仅有两个小球带同种电荷

B.仅有三个小球带同种电荷

C.cd小球带同种电荷

D.cd小球带异种电荷

图1

答案

解析:由可知带同种电荷,且与带异种电荷;由可知带同种电荷,带异种电荷,选项A错,B对,C错,D对.

答案:BD

相关题目

请为下面的一则新闻拟写一个标题。(30字以内)(3分) 【中新江
请为下面的一则新闻拟写一个标题。(30字以内)(3分) 【中新江苏网连云港10月13日电】   昨天下午,江苏省连云港市2009中国·东海“水晶公主”模特大赛
 Water and its importance to human life were the centre of the world’s atten
 Water and its importance to human life were the centre of the world’s attention last week. March 22 was World Water Day and   1   the theme “Water for Life”. There are more than one bi
 Alice trusts you; only you can ______ her to give up the foolish dream of cli
 Alice trusts you; only you can ______ her to give up the foolish dream of climbing the tall tower.    A. suggest               B. advise               C. organize 
已知函数f(x)=x2﹣2x+alnx(a∈R). (Ⅰ)当a=2时,求函数f
已知函数f(x)=x2﹣2x+alnx(a∈R). (Ⅰ)当a=2时,求函数f(x)在(1,f(1))处的切线方程; (Ⅱ)当a>0时,求函数f(x)的单调区间; (Ⅲ)若
如图所示,已知在矩形中,,,在边上取一点,将△折叠,
如图所示,已知在矩形中,,,在边上取一点,将△折叠,使点恰好落在边上的点处,请你求出的长.
200多年来,美国创造性地走出了一条自己的发展道路。目前
200多年来,美国创造性地走出了一条自己的发展道路。目前,它是世界上惟一的超级大国。 “从世界史的观点来看,美国革命之所以重要并不是因为它
–Would you like some more juice? --____.I like the juice very much. A. No, th
–Would you like some more juice? --____.I like the juice very much. A. No, thanks             B. Just a little, please C. Sorry, I don’t know      D.I don’t want any
Science is still largely ignorant _____ the causes of many kinds of cancer. A. a
Science is still largely ignorant _____ the causes of many kinds of cancer. A. about  B. with    C. of       D. to

最新题目