问题 选择题

下列说法正确的是(  )

A.发现有人触电时,应迅速用手把他拉开

B.发现用电器着火了,立即用水把火浇灭

C.三孔插座中的保护接地线PE必须与大地直接连接

D.低压带电体和高压带电体都可以靠近

答案

A、发现有人触电时,若用手去拉,也会触电,故A错;

B、发现用电器着火了,因为水是导体,不能用水去浇灭,而应立即断开电源,再想法灭火,故B错;

C、三孔插座中间多出的那个孔是用来接地线的,当用电器的三脚插头插入时,用电器的金属外壳通过三孔插座的A孔与大地相连通,如果金属外壳漏电,地线将人体短路,防止人触电,故C正确;

D、高压触电有高压电弧触电和跨步电压触电两种,所以对于高压带电体不得靠近,故D错.

故选C.

单项选择题 案例分析题
阅读理解

NSE Summer School is suitable for those who are at, or are about to start university. It will begin accepting applications in January 2013.

Courses: Accounting and Finance; Economics; Management; Law; International Relations; Government and Society Dates: Session I: 7 July~25 July       Session2: 28 July~15 August

Rate: Standard Rate: One session: $1,400; Both session: $2,400

Reduced Student Rate: One session: $1,100; Both session: $1,875

The reduced student rate applies to full-time students registered at a university or college anywhere in the world. Accommodation is not included, and fees range from $500~~$1,000 for 20 nights. Applicant requirements:

If you have studied in the USA then you do not need any additional English qualifications. Students from other countries will generally not require a visa to study at the Summer School; however, you will enter the USA as a “Student Visitor”. You are permitted to change courses before the start of the program and within the first three days of the session.

Contact hours and teaching methods:

Summer School courses are full-time and normally consist of 48 contact hours over the three-week period, taking the form of 36 hours of lectures and 12 hours of classes. Lectures, attended by all students, take place in either the morning or afternoon supplemented by small one-hour classes, of approximately 15 students.

Assessment and examinations:

Assessment for Summer School is based upon the results of either two written examinations, or a final written examination and assessment work. Everyone is required to take the examinations and no exception can be made for any reason.

Summer School lecture series:

Famous economists一Tony Giddens and David Held—have agreed to give lectures to Summer School participants in July in 2013.

If any questions, please click here to see our Frequently Asked Questions/ Contact Us Page.

小题1:During the course, ______

A.students can learn about everything from culture to science

B.students can choose not to attend the lectures they don’t like

C.world-famous economists will give students lessons every day

D.all the students must take part in the exams without any excuse小题2:From the passage, we can learn that______.

A.the program is specially designed for foreign students

B.NSE Summer School 2013 is a university-level program

C.students can change their courses whenever they want to

D.a visa is required to study at the NSE Summer School 2013小题3:The purpose of the advertisement is to______.

A.attract students to NSE Summer School

B.introduce famous economists to students

C.help students to pass the final exams

D.advertise for new staff for university小题4:You will most probably find this passage______.

A.in a newspaper

B.in a guidebook

C.on a webpage

D.in a magazine