第8题: [单项选择]220kV/110kV/10kV变压器一次绕组为YNynd11接线,10kV侧没负荷,也没引线,变压器实际当作两绕组变压器用,采用微机型双侧差动保护。对这台变压器差动二次电流是否需要进行转角处理(内部软件转角方式或外部回路转角方式),以下正确的说法是()。 A. 高中压侧二次电流均必须进行转角。无论是采用内部软件转角方式还是外部回路转角方式; B. 高中压侧二次电流均不需进行转角; C. 高压侧二次电流需进行外部回路转角,中压侧不需进行转角; D. 中压侧二次电流需进行外部回路转角,高压侧不需进行转角。 参考答案:A
第17题:[单选题]The research by Blackburn and Greider helps suggest the role of A.money in medical research. B.proteins in cancer treatment. C.hormones in the functioning of life. D.telomerase in the growth of cancer cells. 参考答案:A
第25题: [单项选择]Even though the Italian authorities may no longer ______ any old bank that gets into trouble, the likelihood of government support for big banks has not changed enough to affect its ratings. A. bail out B. draw out C. hang out D. knock out 参考答案:A