问题 问答题 简答题

插上铁轭叠片须注意什么?

答案

参考答案:

(1)插上铁轭叠片要从铁心中间一级向两面同时进行,避免插错、多插或少插。

(2)插装时应经常修整,使叠片接头缝隙最小,不重叠。修整时,必须垫硬木或铜块,用小锤或木槌轻轻敲打,防止硅钢片毛刺增大或把边砸坏。

(3)插好的硅钢片应随时用临时夹具夹住,防止倾倒及松散。

(4)两边插片速度尽量保持一致并随时把插好的叠片往里推,以防止铁轭倾斜。

(5)保持清洁,不损伤硅钢片绝缘。

填空题


In the following passage, there are 20 blanks representing the words that are missing from the context. You are to put back in each of the blanks the missing worD.The time for this section is 20 minutes.
Many things about language are a mystery, and many will always remain so. But some things we do know.
First, we know that all human beings have a language of some sort. (1) is no race of men anywhere on earth so backward that it has (2) language, no set of speech sounds by which the people communicate with one (3) . Furthermore, in historical times, there has never been a race of men (4) a language.
Second, there is no such thing as a primitive language. There are many people (5) cultures are underdeveloped, who are, as we say, uncivilized, but the (6) they speak are not primitive. In all known languages we can see complexities (7) must have been tens of thousands of years in development.
This has not (8) been well understood; indeed, the direct contrary has often been stateD.Popular ideas (9) the language of the American Indians will illustrate. Many people have supposed that the Indians (10) in a very primitive system of noises. Study has proved this (11) be nonsense. There are, or were, hundreds of American Indian languages, and all of them (12) out to be very complicated and very old.They are certainly (13) from the languages that most of us are familiar with, but they are (14) more primitive that English and Greek.
A third thing we know about language (15) that all languages are perfectly adequate. That is, each one is a perfect (16) of expressing the culture of the people who speak the language.
Finally, we (17) that language changes. It is natural and normal for language to change; the (18) languages which do not change are the dead ones. This is easy to (19) if we look backward in time. Change goes in all aspects of language. (20) features change as do speech sounds, and changes in vocabulary are sometimes very extensive and may occur very rapidly. Vocabulary is the least stable part of any language.

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