问题 问答题 简答题

什么叫保护接零,其安全原理是什么?

答案

参考答案:

所谓保护接零,就是把电气设备在正常情况下不带电的金属部分于电网的保护零线(保护导体)紧密联结起来。其安全原理是借接零使设备漏电形成单相短路,促使线路上的短路保护元件迅速动作,在规定时间内将故障设备切断电源。消除电击危险。

阅读理解

Arabs consider it extremely bad manners to start talking business immediately. Even the busiest government official always takes extra time to be polite and offer refreshments (茶点). No matter how busy you are, you should make time for this.

The conference visit is a way of doing business throughout the Arab world. Frequently, you will have to discuss your business in the presence of strangers, who may or may not have anything to do with your business. Do not be surprised if your meeting is interrupted several times by people who come into the room unannounced, whisper, or speak softly to the person with whom you are talking, and leave. Act as though you do not hear, and never show displeasure at being interrupted.

Making decisions quickly is not an Arab custom. There is a vagueness (模糊) in doing business in the Middle East which will puzzle a newcomer. Give yourself lots of time and ask lots of questions.

When an Arab says “yes”, he may mean “maybe”. When he says “maybe”, he probably means “no”. You will seldom get a direct “no” from an Arab because it is considered not polite. Instead of “no”, he will say “inshallah”, which means “if God is willing”. On the other hand, “yes” does not necessarily mean “yes”. A smile and a slow nod might be like an agreement but in fact your host is being polite. An Arab considers it rude to disagree with a guest.

小题1:The main purpose of this article is to explain _________________.

A.why you need extra time when you visit Arab countries

B.how to be polite when doing business in the Arab world

C.why Arab officials are so busy

D.what Arabs say when doing business小题2:According to the article, which of the following would be considered polite?

A.You leave angrily because of interruptions.

B.You demand an immediate decision.

C.You refuse a cup of tea and show pictures of your product right away.

D.You look out of the window while a stranger comes in to speak with your host.小题3:Which of the following is NOT an Arab custom?

A.To care less about being interrupted during their meeting.

B.Often to give you a vague answer.

C.Seldom to say “no” directly.

D.Seldom to hesitate to start talking business in the presence of strangers.

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