真空断路器的优点简述？_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题简答题

真空断路器的优点简述？

答案

参考答案：

熄断过程在容器中完成，不会对周围的绝缘造成闪络或击穿；燃弧时间短电弧电压低，能量少，适于频繁操作；触头行程短，开断速度低；灭弧室触头不需检修；灭弧介质为真空，无爆炸火灾危险

选择题

依次填入下列横线处的词语，恰当的一组是( )

泰姬陵是莫卧儿王朝君主沙贾汗为其宠妃蒙泰姬修建的_______。这是一座_______着宝石的伊斯兰建筑。后来，泰姬陵成为世界文化遗产。____在今天的众多的世界文化遗产中，它也是______的。

A．陵墓点缀虽然绝无仅有

B．陵寝镶嵌即使独树一帜

C．墓茔装饰固然独一无二

D．墓室装点尽管举世无双

完形填空

Dear Seth,
You are only three years old, and at this point in your life you are not able to understand this letter. But some day when you___36___, I hope you will find something __37__in what I am going to share with you.
Life can be __38__ . There will be people in your life who won’t be very nice. They’ll __39___ you because you are different, 40 for no good reason . You will also face heartbreak and might be __41__ by those you love. I hope you don’t have to face these too much , but such things __42__.
Be open to life anyway. You’ll find cruelty(残忍) and 43 in your journey through life , but don’t let that__44__ you from finding new things . Don’t retreat （退却）from life , and don’t __45__ or wall yourself off . Be open to new things , new experiences ,and new people . You will __46__ many times ,but if you allow that to stop you from trying , you will __47_ many chances . Do remember failure is a stepping stone to __48__.
You will meet many people who will try to do __49__ than you , in school, in college, and at work. They’ll try to have nicer cars, bigger houses, nicer clothes, and so on. . To __50_ , life is a competition.However, I believe life is a __51_. If you always try your best to __52__ others, you are wasting your life . Learn to enjoy your life__53_ and you will make it a journey of __54__ ,of learning and of love.
Finally , know that I love you and always will. You are _55__ a really wonderful journey , and I will always be there for you.
Love
Dad

D．interesting