如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,

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问题:

如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,串联在原线圈电路中电流表的示数为1A,下列说法正确的是(  )

A.变压器输出端所接电压表的示数为20V

B.变压器的输出功率为200W

C.变压器输出端的交流电的频率为50Hz

D.穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s

考点:变压器的结构和原理
题型:多选题

摩尔是系统中所含基本单位(原子、分子、离子、电子等)数与12克C-12的原子数相等的物质量。

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C

For many businessmen online education has been a dream. Now it has come true. The investment (投资) in higher education, whether financial or in terms of time, has long been impossible for many of them. But well-known educational institutions have chosen to deliver an internet-based program, and these barriers have been lifted.

That is good news for people eager to improve themselves and is more attractive to employers. It is also a benefit to industry with better qualified candidates applying for jobs at every level.

Having the benefits of a higher qualification without going to the university campus is attractive to many students. Campus study means greater cost, while online programs are flexible and save time, whether at home or at work. Students can achieve their degrees without causing too much disruption to their career or home life.

In addition to affordable, flexible classes and greater convenience, students also have access to the online learning resources of many of the world’s top educational institutions. They can also communicate with their tutors no matter what time it is or whether either party is away for any reason.

This has opened up the possibility of getting a qualification from a university or college that many students could only have dreamed of in the past. It also allows specialists to get the precise qualifications and focus on their studies. As well as seeing the increase of applicants from lower-incomes and housewives, studying online in the US is even becoming popular with younger people of college age.

Employers have become increasingly welcome and positive to online qualifications as more candidates earn them, especially if they’re properly approved by the US Department of Education.

US institutions have led the way in online education provision. Many top US colleges and universities offer a range of online programs that are highly respected and in every way perfectly fit for adults who need to combine their studies with a working life.

63. According to Paragraph 1, many US colleges and universities ______.  

A. have begun to lift the barriers to financial investment

B. have begun to run an internet-based program

C. have had a dream of offering online education

D. have gained financial investment

64. Why do people choose online education?

A. They can find jobs more easily than on-campus graduates.

B. They can get qualifications from US Department of Education.

C. They can save money and arrange their time and courses freely.

D. They can invest money in different courses provided online.

65. The underlined word “disruption” in the third paragraph probably mean ______.

A. dissatisfaction      B. attention       C. attraction     D. interruption

66. Which would be a good title for the passage?

A. Adult Education Online

B. The Best of USA’s Online Education

C. Top US Universities Offering Online Education

D. Online Education Taking the Place of Campus Education

题型:多选题

可出现心动过缓及直立性低血压的是()

A.双嘧达莫

B.呋喃妥因

C.苯巴比妥

D.氯苯那敏

E.可乐定

题型:多选题

患者,男,56岁。精神不振,体倦乏力,面色萎黄,畏寒肢冷,腰膝酸软,阳痿,舌淡脉沉细。

下列选项,不宜选择的药组是()

A.远志、石菖蒲

B.黄芪、甘草

C.党参、白术

D.杜仲、续断

E.鹿茸、巴戟天

题型:多选题

关于T11DPO仪表档位和里程不显示的解决方案()

A.更换组合仪表

B.更换TCU

C.更换ECU

D.更换DPO转换模块

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