【单选题】
BE004 20一35 kV验电器的工频交流耐压标准为___。
A. 80 kV
B. 90 kV
C. 100 kV
D. 105 kV
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答案
C
解析
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互感器瓷件有严重损伤的是___
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BA024 磁吹避雷器因利用了___,间隙的去游离作用增强,提高了灭弧能力。
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BA008 变压器并列运行的基本条件是一、二次电压相等,___,连接组别相同,容量比不超过1/3 。
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在进行电压源与电流源的等效变换时,应考虑电压源的极性与电流源的方向,必须使电流源输出电流的一端与电压源的___相对应。
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A. 15
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【单选题】
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( ) 26.With help from a Mr. H, you can__________. A. stop wearing your watch B. get new books and objects C. finish your homework on time D. know when parents or teachers are near
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【单选题】
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( ) 29. When was canned food invented? A. In 1870.          B. In 1810. C. In 1902.          D. In 1926.
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【单选题】
( ) 30. After the trip to the Arctic, Clarence Birdseye invented ____________. A. canned food             B. can openers C. frozen food           D. air conditioning
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【单选题】
( ) 31. Changes in weather _____________ in Willis Carrier's company. A. helped to keep food           B. made rooms comfortable C. caused health problems        D. hurt printing paper
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【单选题】
( ) 32. According to the passage, which of the following may lead to inventions? A. People's needs.             B. Public support. C. Modern technology.          D. Practical suggestions.
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【单选题】
( ) 34. Why did the father not ask his son not to do this and do that?    A.Because he felt quite confident of his son.    B.Because he was born from a poor family.    C.Because he was a man of few words.    D.Because he didn't want to be much too strict with his son.
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( ) 35. What would someone learn from this passage?    A.How to live by oneself. B.How to stand on one's own feet.    C.What a good father should do. D.What the self-important is like.
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【单选题】
( ) 36. What may be the proper Chinese for the underlined part in the passage?    A.闲暇时光 B.学费 C.精神空虚 D.经济不足
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( ) 37. The Chinese Yellow Sea Wetlands are in the _______ of China.    A.south           B.east    C.west            D.north
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