问题 单项选择题

高频通道中在变量器与高频电缆芯间串入一小电容的绝缘耐压水平应为交流______________.

A、1500V,50Hz,1min

B、1500V,50Hz,2min

C、2000V,50Hz,1min

D、2000V,50Hz,3min

答案

参考答案:C

解析:题目来源:电力系统继电保护实用技术问答
设备类型:线路
难度等级:较难
电压等级:500kV及以下
知识点:高频通道

阅读理解

根据短文内容,从下框的A-F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余项。(注意:答案E涂AB,F涂BC)

小题1:People have expressed themselves through the movements, steps, and rhythms of dance since the beginning of time. They have prayed and celebrated their victories through dance. People have mourned their dead and healed their sick through dance, the language of the body.

小题2:Today there are many kinds of dancing. For example, there is folk dancing, ballet dancing, and modern dancing. Modern dance, which began in the early 1900s, is a very expressionistic dance. Modern dancers follow no set pattern. Rather, they create their own movements to match the feeling they are trying to express. But modern dance means more than just self-expression.

小题3:Martha Graham is one of the world’s greatest modern dancers. As a young dancer, she studied with some of the founders of the modern dance movement. Influenced by many different kinds of dancing, Martha Graham developed her own personal dance style. She later formed her own dance company and school in the New York City. The following are some of her feelings about her art.

小题4:The modern dancer’s costume is an important part of his or her dance. There is always some reason why a dance costume should be a certain color or an outfit cut in a certain way. The reason comes out of the dance itself. Unlike a ballet costume, a modern dance costume is left of the dancers’ art except the pictures and the memories.

小题5:Dances come from something deep within a person. That something cannot be expressed with words--- it must be told through movement. Because dance expresses emotions, it affects the mind and the body. Dance should not be taken apart interpreted-dance must be experienced.

单项选择题