变压器的零序保护在什么情况下投入运行？_爱下问搜题

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问题问答题简答题

变压器的零序保护在什么情况下投入运行？

答案

参考答案：

变压器零序保护应装在变压器中性点直接接地侧，用来保护该侧绕组的内部及引出线上接地短路，也可作为相应母线和线路接地短路时的后备保护，因此当该变压器中性点接地刀闸合入后，零序保护即可投入运行。

判断题

危险货物中毒急救要领为安全救离毒物污染区、迅速抢救生命、彻底清除毒物污染，防止继续吸收，送医院治疗。

完形填空

It was a quiet morning during the war. In a small valley, there was a little wooden building, which was an orphanage (孤儿院) that__16__ many young children who had lost their ___17__ in the war. Suddenly, a shell (炮弹) __18__ on the top of the orphanage’s building. Many children were ___19__. One little girl was badly hurt and bleeding. A runner was at once sent to __20__medical help.
When the doctor arrived, he_21_ that the girl’s greatest need at the moment was blood. He immediately checked the records in the__22__ to find someone who had the same blood type as the girl’s. A nurse soon __23__the children that had the same blood type together and asked who would be __24__ to donate blood to the girl. The children looked shocked, and no one said a word. Again with __25____ eyes, the doctor pleaded (恳求). __26__ a boy slowly raised his hand.
When the doctor injected the needle, the boy began to cry. The doctor tried to _27__ him, but in vain. Even when the needle was _28__ , the little boy was still crying. After the blood was given to the wounded girl, her___29__ got better. Then the doctor came to the boy, "Does it hurt?" "No, but I was afraid of dying." The doctor was __30_! "Why did you think you would die? "With __31_ in his eyes the boy replied, "Because I thought you would take all of my __32__ to save her! "The doctor didn’t know what to say! Then he asked, "__33_you thought you were going to die, why did you__34__to give her your blood?" With tears streaming down, he said in a___35__ voice, "Because she is my friend and I love her." There is no greater love in the world!

C．regrettable

A．immediately

A．disappeared

D．embarrassed