如图甲,真空中有一半径为R、电荷量为+Q的均匀带电球体,以球心为坐标原点,沿半径

题型:选择题

问题:

如图甲,真空中有一半径为R、电荷量为+Q的均匀带电球体,以球心为坐标原点,沿半径方向建立x轴。理论分析表明,x 轴上各点的场强随x变化关系如图乙,已知x1与R两点间距大于R与x2的两点间距,则

A.x2处场强大小为

B.x1、x2两点处的电势相同

C.球内部的电场为匀强电场

D.假设将试探电荷沿x轴移动,则从x1移到R处和从R移到x2处静电力做功相同

考点:电场强度的定义式
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等腰梯形腰长为12cm,上底长为15cm,上底与腰的夹角为120°,则梯形下底的长为______.

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根据所给的中文及上下文意思完成以下信件,一空一词。(本题有10小题,每小题1分,共10分)

Dear Tom,

I am glad that you and your sister enjoyed your holiday with me.

We have been back at school three weeks now. It feels like three months! You know we all 小题1:____(想念) you very much. We小题2:____(期待) that you are both working very hard now because you are in Grade Nine now. My friends went for a 小题3:____ (野餐) yesterday but I didn't go with them, because I小题4:__ (受伤) my foot and I couldn't walk very well. It was nothing serious, so I told them not to小题5:___(担心)about me. I stay at home and watch news on TV at the moment. It talks about that Diaoyu Island小题6:____(属于) to China. Meanwhile, I also eat some小题7: ____ (甜的) biscuits. I小题8:__ (真地)enjoy myself.

I hear that you have小题9:___ (困难) in learning English. I hope you don’t小题10:_ (失去) your heart.

Best wishes to you.

Yours,

Lucy

题型:选择题

有限责任公司的特征有( )

A.资合性

B.封闭性

C.设立程序简单

D.人资两合性

E.组织设置灵活

题型:选择题

砖胎膜

题型:选择题

下列不属于电力系统中性点接地方式的是()。

A.中性点直接接地

B.中性点不接地

C.中性点阻抗接地

D.中性点容抗接地

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