如图15-1-18所示,ab、cd是两根在同一竖直平面内的直导线,在两导线中央悬

题型:选择题

问题:

如图15-1-18所示,abcd是两根在同一竖直平面内的直导线,在两导线中央悬挂一个小磁针,静止时在同一竖直平面内.当两导线中通以大小相等的电流时,小磁针N极向纸里面转动,则两导线中的电流方向(  )

图15-1-18

A.一定都是向上

B.一定都是向下

C.ab中电流向下,cd中电流向上

D.ab中电流向上,cd中电流向下

考点:电流的磁场,安培定则
题型:选择题

阅读理解

     Lisa, a 25year old from Beijing, recently places a number of very unpleasant statements on the

Internet regarding the elderly.They include things like "don't  rely on others", "don't expect others to

help", "don't be talkative", and "dont't be so stubborn". The underlying message was that elderly

people should not take advantage of their old age to demand special favours from others, particularly

from the young.This of course flies_in_the_face_of the Chinese tradition of respecting the elderly.But,

in my opinion, Lisa's "requests" might not be totally unreasonable.Old people do sometimes behave

like they're "stubborn"and "talkative". Still, the young woman is rudely insensitive to why the elderly

behave that way.As people get old, they become increasingly weakened physically.So it's natural for

them to ask for more help from others.As their memories decline, they tend to be talkative because

they easily forget what has just been said.The American psychologists D. R.Atkinson and G. Hackett

said that the brain is characterized by flexibility.It has the ability (most pronounced up to the age of 12)

to change itself as a result of experience.But, as the brain ages, this flexibility decreases.As a result, the

elderly are often inflexible in their ways.

      Therefore, old people need real care and deserve to be taken care of.Many have devoted most of

their lives to the wellbeing of the family or social.Their aging is no reason for showing prejudice (偏见)

to them. According to Chinese tradition, older people are to be respected.As are Westerners.

     I live in the US for eight years, and in Hong Kong for 13.Never have I seen or heard anyone who

would openly tell old people "to behave themselves".

     We may encourage old people to be more selfreliant.But rudely demanding that they do so is ageism.

That's where the difference lies.

1. What does Lisa think of the elderly?

A. The elderly hate to rely on the others.

B. The elderly should take advantage of their old age.

C. They are not talkative but stubborn.

D. The elderly always demand special favors from the young.

2. The underlined part in the first paragraph can be replaced by"________".

A. expresses the apparent meaning of

B. shows disagreement with

C. deals with the surface meaning of

D. draws a conclusion from

3. What's the writer's attitude towards this problem?

A. The young woman is too sensitive to why the elderly behave that way.

B. The elderly naturally ask for more help from others, because their brain is characterized by flexibility.

C. The elderly are often inflexible in their ways, which makes the young suffer.

D. The elderly deserve to be taken care of and we shouldn't show our prejudice because of their aging.

4. The last three paragraphs really want to show that________.

A. we should respect the elderly

B. the people in the US or Hong Kong respect the older people

C. old people should be encouraged to be more selfreliant

D. different ideas about the elderly are allowed to exist

题型:选择题

煤矿企业主要负责人、安全生产管理人员必须参加具备相应资质的煤矿安全培训机构组织的安全培训,经煤矿安全监察机构对其安全生产知识和管理能力考核合格,取得安全资格证。

题型:选择题

男性,59岁,因右腹股沟斜疝行手术治疗。术中发现疝囊壁的一部分由盲肠组成,此时的诊断为()。

A.Richter疝

B.Littre疝

C.滑动疝

D.难复性疝

E.易复性疝

题型:选择题

新课程规定()由语言与文学、数学、人文与社会、科学、技术、体育和健康、艺术和综合实践活动构成。

题型:选择题

截止阀应是与流体管线相()安装。

A.垂直

B.相反向

C.相正向

D.平行

更多题库