问题 问答题 简答题

在运行工作中,对熔断器应注意什么?

答案

参考答案:

应注意以下几点:

(1)熔断器、熔体都要安装可靠;否则,一相接触不良,造成电动机单相运行会使其烧毁。

(2)熔体要接触良好。熔体接触不良会严重发热,造成熔体误熔断,有时还因接触不良产生火花会干扰弱电装置。

(3)更换熔体时,应检查新熔体的规格和形状是否与原熔体一致。

(4)熔断器周围的温度不能太高;否则易误熔断。

(5)安装熔体时不能使其受机械损伤;否则相当截面减小易熔断。

(6)如熔体有氧化腐蚀现象,应及时更换,不然保护特性要起变化。

(7)熔断器和熔体应有备件,需要时及时更换。

完形填空

Friends play an important part in our lives, and although we may take the fact of friendship for granted, we often don’t clearly understand how we make friends. While we get on well with a number of people,      小题1:   .

Moreover, a great many relationships come under the general term “friendship”. In all cases, two people like one another and enjoy being together, but beyond that, the degree of closeness between them and the reasons for their interest in each other change greatly.

At the beginning, much depends on how people meet, and on good first impressions. As we get to know people,    小题2:   . Although these factors are not of the greatest importance, it is more difficult to have a good relationship with people when there is a big difference in age and background.

Then,   小题3:  . Friends will stand closer together and will spend more time looking at each other than ordinary friends. Smiles and soft voices also express friendliness, and it is because they may give the wrong signals that shy people often have difficulty making friends. A friendly look with a wrong facial expression can turn into an unfriendly stare, and nervousness may be wrongly understood as unfriendliness.

Some relationships are a result of argument and discussion, but it is usual for close friends to have the same ideas and beliefs, the same opinion and interests. The more closely involved people become, the more they depend on each other. And    小题4:   . Equally, friends have to learn to make allowances for each other, to put up with annoying habits, and to accept differences in opinion.

In contrast with marriage,   小题5:   . But the support and understanding that results from shared experiences and affections does seem to create a close and lasting relationship.

A.we are usually friends with only a few

B.many factors can affect friendship and relationship

C.people want to do friends favors and hate to let them down

D.argument and discussion can improve personal relationshipsE. we consider things like age, race, looks, economic and social status, etc

F. we pay attention to actual behavior, facial expression, and the way a person speaks

G. there are no friendship ceremonies to strengthen the relationship between two people

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