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以下哪些不是交流传动技术的优点 A、功率因数高 B、电机体积、重量小 C、控制技术简单 D、电制动能量可以回馈……

以下哪些不是交流传动技术的优点
A、功率因数高
B、电机体积、重量小
C、控制技术简单
D、电制动能量可以回馈电网

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未分类题Nowadays, a standard for measuring power has changeD.These changes foretell a new standard for measuring power. No longer will a nation's political influence be based solely on the strength of its military forces. Of course, military effectiveness will remain a primary measure of power. But political influence is also closely tied to industrial competitiveness. It's often said that without its military the Soviet Union would really be a third-world nation. The new standard of power and influence that is evolving now places more emphasis on the ability of a country to compete effectively in the economic markets of the worlD.America must recognize this new course of events. Our success in shaping world events over the past 40 years has been the direct result of our ability to adapt technology and to take advantage of the capabilities of our people for the purpose of maintaining peacE.Our industrial prowess (杰出才能) over most of this period was unchallengeD.It is ironic that it is just the prowess that has enabled other countries to prosper(繁荣) and in turn to threaten our industrial leadership.The competitiveness of America's industrial base is an issue bigger than the Department of Defense and is going to require the efforts of the major institutional forces in our society--not be a strong force in the process because we will. But we simply cannot be, nor should we be, liked upon by others as the savior (救星) of American industry.Now a nation's political influence depends on ______.A.the strength of its military forcesB.its ability to compete in industryC.economic marketsD.both A and B

A.B.
C.
Now
D.
A.the
E.its
F.economic
G.both

未分类题听力原文: University teaching in the United Kingdom is very different at both undergraduate and graduate levels from that of many overseas countries.An undergraduate course consists of a series of lectures, seminars and tutorials, and in science and engineering, laboratory classes, which in total account for about 15 hours per week. Arts students may well find that their official contact with teachers is less than this average, while science and engineering students may expect to be timetabled for up to 20 hours per week. Students studying for a particular degree will take a series of lecture courses which run in parallel at a fixed time in each week and may last one academic term or the whole year. Associated with each lecture course are seminars, tutorials and laboratory classes which draw upon, analyze, illustrate or amplify the topics presented in the lectures. Lecture classes can vary in size from 20 to 200 although larger sized lectures tend to de crease as students progress into the second and third year and more options become availablE.Seminars and tutorials are on the whole much smaller than lecture clasps and in some departments can be on a one-to-one basis. Students are normally expected to prepare work in advance, for seminars and tutorials and this can take the form. of re searching a topic for discussion, by writing essays or by solving problems. Lectures, seminars and tutorials are all one hour in length, while laboratory classes usually last 2 or 3 hours. Much emphasis is put on how to spend as much time if not more studying by themselves as being taught. In the UK it is still common for people to say that they are 'reading' for a degree!(33)A.Science courses are more motivating than arts courses.B.Science courses are more interesting than arts courses.C.Arts courses have more classes than science courses.D.Science courses are more demanding than arts courses.

A.B.Science
C.
B.Science
D.
C.Arts
E.
D.Science