在断路器触头间加装并联电阻的作用是()。A.提高恢复电压的上升速率,防止出现振荡过电

题型:单项选择题

问题:

在断路器触头间加装并联电阻的作用是()。

A.提高恢复电压的上升速率,防止出现振荡过电压

B.降低交流电弧恢复电压的上升速率,防止出现振荡过电压

C.提高介质强度,防止电弧重燃

D.降低介质强度,防止电弧重燃

考点:电力线路工电力线路工题库
题型:单项选择题

给出如下n个平方数:12,22,…,n2,规定可以在其中的每个数前任意添上“+”号或“-”号,所得的代数和记为L.

(1)当n=8时,试设计一种可行方案使得|L|最小;

(2)当n=2005时,试设计一种可行方案使得|L|最小.

题型:单项选择题

半径等于6cm的圆内有长为6cm的弦,则此弦所对的圆周角的度数为______.

题型:单项选择题

周围神经损伤后半个月,针极肌电图可见到的是()。

A.插入电位减弱或消失

B.纤颤电位

C.群放电位

D.肌强直电位

E.长时限运动单位电位

题型:单项选择题

(五)

So long as teachers fail to distinguish(differ) between teaching and learning, they will continue to undertake to do for children that which only children can do for themselves. Teaching children to read is not passing reading on to them. It is certainly not endless hours spent in activities about reading. Douglas insists that "reading cannot be taught directly and schools should stop trying to do the impossible".

Teaching and learning are two entirely different processes. They differ in kind and function. The function of teaching is to create the conditions and the climate that will make it possible for children to plan cleverly the most efficient system for teaching themselves to read. Teaching is also a public activity. It can be seen and observed.

Learning to read involves all that each individual does to understand the world of printed language. Almost all of it is private, for learning is an occupation of the mind, and that process is not open to public scrutiny.

If teacher and learner roles are not interchangeable, what then can be done through teaching that will aid the child in the long search for knowledge Smith has one principle rule for all teaching instructions. "Make learning to read easy, which means making reading a meaningful, enjoyable and frequent experience for children. "

When the roles of teacher and learner are seen for what they are, and when both teacher and learner fulfill them properly, then much of the pressure and feeling of failure for both is got rid of. Learning to read is made easier when teachers create an environment where children are given the chance to solve the problem of learning to read by learning.

The teaching of reading will be successful if().

A.teachers can make their teaching activities observable

B.teachers can teach their students how to read

C.teachers can improve conditions at school for the students

D.teachers can enable students to develop their own way of reading

题型:单项选择题

铁路行车基本闭塞法有自动闭塞和()两种。P195

A.半自动闭塞

B.电气联锁

C.路签闭塞

D.手动闭塞

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