如图所示,理想变压器原副线圈匝数之比为n1:n2=22:1,原线圈接在电压为U0

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问题:

如图所示,理想变压器原副线圈匝数之比为n1:n2=22:1,原线圈接在电压为U0=220V的正弦式交流电源上,副线圈连接理想电压表V、交流电流表A、理想二极管D和电容器C.则(  )

A.电压表的示数为10V

B.电容器不断地充电和放电,电量不断变化

C.稳定后电流表的读数为零

D.稳定后电容器两极板间电势差始终为10

2V

考点:电容器的概念和原理变压器的结构和原理
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参与政治生活,贵在实践。作为中学生参与政治生活的实际活动可能是(  )

①参加国家大政方针的制定  ②参加学校的时事政治学习

③参加共青团              ④参加选举活动

A.①②③

B.②③④

C.①②④

D.①②③④

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阅读理解

     China Daily Oct.11,2008-The Ministry of Health has called for more awareness from the public on

the mental health of the young,as part of efforts to mark World Mental Health Day which fell on Friday.

     More than 15 percent of Chinese youths have been found with mental problems,and about 30 million

young people under 17 are suffering from depression,the Shanghaibased Wenhui Daily reported.The

World Health Organization estimates that before 2020,the rate of children with mental problems will

increase to 50 percent,and mental problems will become a major factor behind deaths and illness in the

young worldwide.

     Deng Xiaohong,the spokesperson for the Beijing Municipal Health Bureau,said rapid social changes

are one of the reasons behind the rising number of youngsters with psychological problems.If these

mental diseases are not addressed on time,occurrence of crimes,drugtaking and other dangerous

behavior are expected to rise.Experts said mental diseases could be caused by many factors,such as the

inability to handle interpersonal  relations well,unstable emotions and pressures from an overload of

studies.A number of experts have also said the onechild policy is another reason leading to poor mental

health in the young.Children are said to be too "spoiled" and "selfish" in a onechild family.

     It's reported that schools in many cities are rolling out measures to help students maintain their mental

wellb eing.Yin Jingmiao,a teacher of the Beijing No.105 Middle School,told China Daily that the school

invites psychologists to provide counseling to students three times a month."Students can be arranged to

have 40minute counseling sessions," Yin said.The school also gives lectures on mental health to senior

grade students before they take the national college entrance exams to help ease any anxiety arising from

the tests.

1. Which of the following can be the best title for the passage?

A. Efforts to Mark World Mental Health Day

B. Seriousness of Youngsters'Mental Health Problems

C. How to Maintain Mental Wellbeing

D. Public Awareness on Youngsters'Mental Diseases Expected

2. The writer intends to tell us in the second paragraph that________.

A. mental health problems of the young are becoming a popular problem

B. only young people are suffering from mental health problems

C. mental problems will become as serious as deaths and illness

D. the rate of children with mental problems will increase to 50 percent

3. Which could be the consequence if the problem is left untreated?

A. Inability to handle interpersonal relations.

B. Unstable emotions.

C. Drugtaking and other dangerous behavior.

D. Rapid social changes.

题型:多选题

根据涂子沛先生所讲,以下说法错误的是哪项()

A.中国社会不会面临数据遗产问题

B.数据垃圾对商业公司是一个挑战

C.个人要把数据当做自己的遗产

D.国家要制定合适的法律来规范数据遗产继承的问题

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止血、止泻宜选用的中药是______

A.山楂
B.炒山楂
C.焦山楂
D.山楂炭
E.麸炒山楂

题型:多选题

将组织变革分为八个环节:变革的力量;认识变革的需要;诊断问题;确定可供选择的组织发展的方法和策略;认识限制条件;选择方法与策略;实施计划和评价计划的是组织变革中的()

A、卡斯特模式

B、勒温模式

C、坦尔模式

D、唐纳利模式

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