题目内容
变压器内的油是起冷却线圈和铁心之用,同时起绝缘作用,因此,油位应正常,油色应清晰透明。( )
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变压器温度以变压器油的下层油温作为标准。( )
变压器通电后,就有嗡嗡地响声,此现象属于正常现象。( )
当环境最高气温为(+40℃)时,变压器的顶层油温不要超过90℃,为了防止变压器油劣化过速,顶层油温不宜经常超过80℃。( )
Part II Vocabulary & Structure(10minutes)Directions:This part is to test your ability to construct correct and meaningful sentences.It consists of2sections.Section ADirections:In this section,there are 10 incomplete sentences.You are required lo complete each one bydeciding on the most appropriate word or words from the 4 choices marked A),B),C)and D) Then you should mark the corresponding letter on the Answer Sheet with a single line through the center:25._________she has saved a lot, she is still unable to afford that house.
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