问题 单项选择题

高频闭锁零序距离保护中,保护停信需带一短延时,这是为了()。

A、防止外部故障时的暂态过程而误动

B、等待对端闭锁信号到来,防止区外故障误动

C、防止外部故障时功率倒向而误动

答案

参考答案:B

解析:题目来源:电力系统继电保护实用技术问答
专业类型:继电保护
设备类型:电力变压器
难度等级:一般
电压等级:其他
知识点:运行规定

阅读理解

Do you like traveling? How can you make your trip interesting? Here’s some advice.

Read!

Before you leave, you should find some information about the place, such as its geography, history and people. You can introduce that place better by reading.

Take photos!

If you want to take some photos, remember to choose the most special sights. Don’t choose the sight you can see in other places. For example, Qingdao and Ningbo are coastal cities, so don’t only take photos of the sea. You should take photos of something else, too.

Taste!

You’d better taste some specials(特产) in the area. Food in some places is very delicious. So why not taste it? Maybe you have just one chance to taste it in your life.

Write!

When you visit a place, you should take a pen and a notebook, so you can write down what you see and what you think during the trip.

小题1:How many pieces of advice about traveling are mentioned(提及) in the passage?

A.Two

B.Three

C.Four.

D.Five小题2:Before we travel to a place, we should__________.

A.learn something about it

B.decide which hotel to stay at

C.decide when to leave

D.Know which bus to take小题3:The underlined word “coastal” means_________ in Chinese.

A.内陆的

B.新兴的

C.沿海的

D.现代的小题4:You should_______ during your trip.

A.take no photos

B.taste some specials

C.write down what you eat

D.read more books小题5:What’s the best title(题目) for the passage?

A.How to make your trip interesting

B.The most popular way to travel

C.How to make a travel plan

D.The best place to travel

问答题