试题与答案

加工表面层产生的残余压应力,能提高零件的疲劳强度。

题型:判断题

题目:

加工表面层产生的残余压应力,能提高零件的疲劳强度。

答案:

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参考答案:管理学上有一个永恒不变的定律:“外部的离心力越大,内部的凝聚力就越强;反之,外部离心力越小,内部凝聚力越弱”。离心力现象反映了计划与执行之间的辩证关系。在日常生活中也是常见的,对于这个问...

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题型:单项选择题

"Sesame Street" has been called "the longest street in the world". That is because the television program by that name can now be seen in: so many parts of the world. That program became one of American’s exports soon after it went on the air in New York in 1969.
In the United States more than six million children watch the program regularly. The viewers include more than half the nation’s preschool children, from every kind of economic, racial, and geographical group.

Children who often watch the program ______ .
A. can have problems in school
B. will find it a great help
C. will take no interest in their studies
D. will be well educated

Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from "Sesame Street" are in the same class with children who have not watched the program.
Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional viewers. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly.
The programs all use songs, stories, jokes, and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters.
Why has "Sesame Street" been so much more successful than other children’s shows Many reasons have been suggested. People mention the educational theories of its creators, the support by the government and private businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for: the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more.

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