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更多“A point charge +Q is held stationary at the origin. A second point charge -q moves from the point r=…”相关的问题
On line courses (also called distance learning) are a hot new trend in American education. According to the nonprofit Distance Education and Training Council, about 400 US colleges and schools offer some portion of their programs on the We b. At the university level, they cost the same as traditional classes and requir e similar weekly assignments and textbook reading, the difference is in class pa rticipation.
Generally speaking, students congregate(使聚集) on line throughout each week to explore topic with the professor, but these discussions occur “asynchronousl y(不同时发生地)” rather than in real time. (You read others’ comments and post your own whenever you get a chance.) Written assignments are posted, you e mail in your work periodically, and you’re required to take a proctored exam in order to receive degree credit. Career boosting business administration and information technology programs are the most popular, but you’ll also find a variety of literal arts offerings, from film theory to medieval history and foreign lang uage study. While you still can’t get an Ivy League degree on line, a growing number of elite(卓越的) institutions, including Stanford and New York Univer sity are beginning to offer on line courses.
The benefits for busy people are obvious. “I always get a front row seat,” says one student studying at the State University of New York Learning Network. “I can get up in the middle of class, grab a cup of coffee. The class is waiting for me when I get back, and I haven’t missed a thing.” On the other hand, some students miss the face to face interaction that often sparks interest and involvement.
36.Generally speaking, on line education costs ____.
A.more than the traditional one B.less than the traditional one
C.as much as the traditional one D.the author hasn’t mentioned
37.The major way to hand out assignments of on line students is ____.
A.to hand out them in person
B.to post them
C.to e mail in them
D.to let the teacher enter into their personal main pages
38.Which kind of program is probably NOT welcomed by most of the students？
A.Software development. B.Decoration and design.
C.International trade. D.Company management.
39.The closest meaning of “Ivy League” (Par. 2) ____.
A.famous universities in USA
B.famous business colleges in USA
C.famous companies in USA
D.universities with a long history
40.It is implied that in USA ____.
A.on line education will take the place of the traditional one soon
B.there are only a few on line programs until now
C.one need not take part in the exam in order to receive a diploma by way of on line education
D.one can not receive a degree certificate of New York University through distant learning
Self-employed private physicians who charge a fee for each patient visit have been the norm for American medical practice. Most physicians have a contract relationship with one or more hospitals in their community. They refer their patients as needed to the hospital, which usually charges according to the number of days a patient stays and the facilities - X-rays, operating rooms, tests - he or she uses.
Some medical doctors are on salary. Salaried physicians may work as hospital staff members, or residents, who are often still in training. They may teach in medical schools, be hired by corporations to care for their workers or work for the federal government's Public Health Service.
Physicians are among the best-paid professionals in the United States. In the 1980s, it was not uncommon for medical doctors to earn incomes of more than $100,000 a year. Specialists, particularly surgeons, might earn several times that amount. Physicians list many reasons why they deserve to be so well rewarded for their work. One reason is the long and expensive preparation required to become a physician in the United States. Most would-be physicians first attend college for four years, which can cost nearly $20,000 a year at one of the best private institutions. Prospective physicians then attend medical school for four years. Tuition alone can exceed $10,000 a year. By the time they have obtained their medical degrees, many young physicians are deeply in debt. They still face three to five years of residency (住院医生实习期) in a hospital, the first year as an apprentice physician. The hours are long and the pay is relatively low.
Setting up a medical practice is expensive, too. Sometimes several physicians will decide to establish a group practice, so they can share the expense of maintaining an office and buying equipment. These physicians also take care of each other's patients in emergencies.
Physicians work long hours and must accept a great deal of responsibility. Many
medical procedures, even quite routine ones, involve risk. It is understandable that
physicians want to be well rewarded for making decisions which can mean the difference between life and death.
第 16 题 Many physicians in the US are self-employed private physicians.
A． Right
B． Wrong
C． Not mentioned
. Under the condition of electrostatic equilibrium, the potential at point P on the surface is V0 as shown in the Figure. What are the magnitude of the field and the potential at the center O? 
A、E=0. V=V0.
B、E=0. V=0.
C、
D、
A、
B、
C、
D、
. Points A and B are at distances a and b from the line. If a point charge 
travels slowly from point A to point B, then the work done by the external force on it is . 
A、
B、
C、
D、
in SI. The electric field 
in vector form at point (x,y,z)=(1,2,3) is ( ) in SI.
A、
B、
C、
D、
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