如图所示,匀强电场E的区域内,在O点放置一点电荷+Q.a、b、c、d、e、f为以

题型:选择题

问题:

如图所示,匀强电场E的区域内,在O点放置一点电荷+Q.a、b、c、d、e、f为以O为球心的球面上的点,aecf平面与电场平行,bedf平面与电场垂直,则下列说法中正确的是(  )

A.b、d两点的电场强度不同

B.a点的电势等于f点的电势

C.点电荷+q在球面上任意两点之间移动时,电场力一定做功

D.将点电荷+q在球面上任意两点之间移动时,从a点移动到c点电势能的变化量一定最大

考点:电场强度的定义式电势能
题型:选择题

In the past ten years, many scientists have studied the differences between men and women. And they all got the same answer: The sexes (性别) are different, because their brains are different. And this, the scientists say, makes men and women see the world in different ways.

Boys, for example, generally are better than girls at mathematical (数学的) ideas. Boys also generally are better than girls at the kind of hand and eye movements necessary for ball sports. Girls, on the other hand generally start speaking earlier than boys. And they generally see better in the dark than boys and are better at learning foreign languages.

What makes men and women better at one thing or another? The answer is the brain. The brain has two sides connected by nerve(神经) tracks. The left side generally is used for mathematics, speech and writing. The right side is used for artistic creation and the expression for emotions. In men and women, different areas in each side of the brain develop differently. In boys, for example, it’s the area used for mathematics. In girls, it is the area used for language skills. Another interesting difference is that the two sides of a man’s brain are connected by smaller nerves than the two sides of a woman’s brain area.

小题1:Which of the following is best to outline(概括) the article?

A. Research on the Brain

B. Differences between Men and Women

C. Who are Better, Boys or Girls

小题2:________ men and women think differently.

A. The different brains make

B. The different experiences make

C. The influences of society make

小题3:According to the article, girls are generally better than boys at _______ in your school.

A. mathematics

B. physics

C. English

小题4:Which of the following is true?

A. The left side of brain in boys generally develops better than that in girls.

B. The left side of brain in girls generally develops better than that in boys.

C. The area in girls used for language skills develops better.

小题5:In men and women the number of nerves connecting the halves of brain _______.

A. is the same

B. is different

C. is zero 

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在水泥砼路面检验评定中,对评分值影响最大的是()。

A、弯沉

B、抗滑

C、弯拉强度

D、平整度

题型:选择题

如图所示,其中R两端电压随通过该电阻的直流电流i的变化关系如图所示,电源电动势为7.0伏特(内阻不计),且R1=1000欧姆(不随温度变化).若改变R2,使AB与BC间的电压相等,这时R的阻值为______千欧;通过R的电流为______毫安.

题型:选择题

X射线机检查员在识别一幅X光机图像时,以下说法正确的是()

A.从图像周围向中间进行判图

B.按照图像灰度的不同进行判图

C.按照图像所呈现的层次进行判图

D.以上说法均正确

题型:选择题

静脉点滴氯化钾的浓度一般为()。

A.0.15%~0.3%

B.0.5%~1%

C.0.6%

D.1%~1.5%

E.1.5%~3%

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