试题与答案

如图所示为固定于绝缘平面上的两个带等量正电荷的小球a和b,开始时a受到的电场力为

题型:多选题

题目:

如图所示为固定于绝缘平面上的两个带等量正电荷的小球a和b,开始时a受到的电场力为F1,当两球所在的区域加一个沿其连线的水平方向匀强电场后,小球a受到电场力为F2,若F1≠F2,则此时小球B受到电场力大小可能为(  )

A.F1

B.F2

C.2F1-F2

D.2F1+F2

答案:

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参考答案:C解析:《最高人民法院关于民事诉讼证据的若干规定》(2001年12月6日最高人民法院审判委员会第1201次会议通过)第36条规定,当事人在举证期限内提交证据材料确有困难的,应当在举证期限内向人民法院申请...

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Foreigners may be surprised at the number of references (15) weather that the British (16) to each other in the course of a single day. Very often conversational greetings are (17) by comments on the weather. “Nice day, isn’t it” “Beautiful!” may well be heard instead of “Good morning, how are you” Although the foreigner may consider this exaggerated and comic, it is (18) .pointing out that it could be used to his advantage. If he wants to start a conversation with a British but is at a loss to know (19) to begin, he could do well to mention the state of the weather. It is a safe subject which will (20) an answer from even the most reserved of the British.

13()

A.since

B.once

C.when

D.while

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