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问题 单项选择题

下列对磁场说法中，错误的说法是（）。

A、判断载流体在磁场中的受力方向时，应当用左手定则

B、当已知导体运动方向和磁场方向，判断导体感应电动势方向时，可用右手定则

C、楞次定律是判断感应电流方向的普遍定律，感应电流产生的磁场总是与原磁场方向相反

D、当回路所包围的面积中的磁通量发生变化时，回路中就有感应电动势产生。这个感应电动势或感应电流所产生的磁通总是力图阻止原磁通的变化。习惯上用右手螺旋定则来规定磁通和感应电动势的方向

答案

参考答案：C

单项选择题

Exceptional children are different in some significant way from others of the same age. For these children to develop to their full adult potential, their education must be adapted to those differences.
Although we focus on the needs of exceptional children, we find ourselves describing their environment as well. While the leading actor on the stage captures our attention, we are aware of the importance of the supporting players and the scenery of the play itself. Both the family and the society in which exceptional children live are often the key to their growth and development. And it is in the public schools that we find the full expression of society’s understanding—the knowledge, hopes, and fears that are passed on to the next generation.
Education in any society is a mirror of that society. In that mirror we can see the strengths, the weaknesses, the hopes, the prejudices, and the central values of the culture itself. The great interest in exceptional children shown in public education over the past three decades indicates the p feeling in our society that all citizens, whatever their special conditions, deserve the opportunity to fully develop their capabilities.
"All men are created equal." We’ve heard it many times, but it still has important meaning for education in a democratic society. Although the phrase was used by this country’s founders to denote equality before the law, it has also been interpreted to mean equality of opportunity. That concept implies educational opportunity for all children—the right of each child to receive help in learning to the limits of his or her capacity, whether that capacity be small or great. Recent court decisions have confirmed the right of all children—disabled or not—to an appropriate education, and have ordered that public schools take the necessary steps to provide that education. In response, schools are modifying their programs, adapting instruction to children who are exceptional, to those who cannot profit substantially from regular programs.

From this passage we learn that the educational concern for exceptional children______.

A．is now enjoying legal support

B．disagrees with the tradition of the country

C．was clearly stated by the country’s founders

D．will exert great influence over court decisions
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单项选择题

天行赤眼的主要特点是（）

A.白睛红赤

B.胞睑红肿

C.畏光流泪

D.邻里相传

E.痒涩不适
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