如图所示的实验装置中,平行板电容器充电后断开电源连接并保持良好绝缘,下列哪些操作

题型:选择题

问题:

如图所示的实验装置中,平行板电容器充电后断开电源连接并保持良好绝缘,下列哪些操作理论上可使静电计指针张角变小?(  )

A.其它条件不变,两板间插入电介质

B.其它条件不变,减小两板的正对面积

C.其它条件不变,减小两板间距离

D.其它条件不变,保持良好绝缘情况下紧B板插入厚度小于板间距离的电中性金属板

考点:电容的定义式平行板电容器
题型:选择题

现有4条线段,长度分别为3cm,5cm,6cm,8cm,从中任取3条,能构成三角形的概率是______.

题型:选择题

直肠肛管周围间隙发生感染而形成脓肿,称为()

A.肛隐窝炎

B.肛痈

C.肛漏

D.肛裂

E.脱肛

题型:选择题

There is a popular belief among parents that schools are no longer interested in spelling. No school I have ever taught in has ever ignored spelling or considered it unimportant as a basic skill. There are, however, different ideas about how to teach it, or how much priority (优先) it must be given over general language development and writing ability. The problem is how to encourage a child to express himself freely and confidently in writing without holding him back with the complexities (复杂性) of spelling.

If spelling becomes the only focal (焦点的) point of his teacher’s interest, clearly a bright child will be likely to “play safe”. He will tend to write only words within his spelling range, choosing to avoid adventurous language. That’s why teachers often encourage the early use of dictionaries and pay attention to content rather than technical ability.

I was once shocked to read on the bottom of a sensitive piece of writing about a personal experience: “This work is terrible! There are far too many spelling errors and your writing is terrible.” It may have been a sharp criticism of the pupil’s technical abilities in writing, but it was also a sad reflection on the teacher who had omitted to read the essay, which contained some beautiful expressions of the child’s deep feelings. The teacher was not wrong to draw attention to the errors, but if his priorities had centered on the child’s ideas, an expression of his disappointment with the presentation would have given the pupil more motivation (动机) to seek improvement.

小题1:Teachers are different in their opinions about _________.

A.the difficulties in teaching spelling

B.the role of spelling in general language development

C.the complexities of the basic writing skills

D.the necessity of teaching spelling小题2: The underlined expression “play safe” probably means ________.

A.to write carefully

B.to do as teachers say

C.to use dictionaries frequently

D.to avoid using words one is not sure of小题3:Teachers encourage the use of dictionaries so that ____________.

A.students will be able to express their ideas more freely

B.students will have more confidence in writing

C.students will have less trouble in correcting mistakes

D.students will learn to be independent of teachers小题4:The author seems to think that the teacher’s judgment on that sensitive piece of writing is __________.

A.unfair

B.reasonable

C.foolish

D.careless小题5:The major point discussed in the passage is ___________.

A.the importance of developing writing skills

B.the complexities of spelling

C.the correct way of marking compositions

D.the relationship between spelling and the content of a composition

题型:选择题

《广告的宣传应用》--在互联网广告媒体中“人人网”属于哪一种网站()

A.社会关系网络

B.合作词条网络

C.视频分享网络

题型:选择题

环境规划的目标的概念:

更多题库