第15题: [单项选择]What is NOT a change to the literature class A. Class location. B. Class times. C. Class length. D. Class size. 参考答案:D 答案解析:M: Excuse me, I’’m enrolled to take Professor Li’’s literature course 102. But I hear some changes h
第23题: [单项选择]某110kV户外变电所,设有两台主变压器,2回电源进线(电源来自某220kV枢纽变电站的110kV出线),6回负荷出线。负荷出线主保护为速断保护,整定时间为T1;后备保护为过电流保护,整定时间为T2;断路器全分闸时间为T3。(供配电2006)请说明选择110kV断路器时,其最高工作电压的最低值不得低于下列哪个数值()? A. 110kV B. 115kV C. 126kV D. 145kV 参考答案:C