第9题:[单选题]2.8根据GB/T 7409.3-2007《同步电机励磁系统 大中型同步发电机励磁系统技 术要求》,在额定功率因数下,当发电机突然甩额定负荷后,发电机电压超调量不大 于( )额定值,电压振荡次数不超过3次,调节时间不大于10s。 A. 15%; B. 20%; C. 25%; D. 30%。 (出处:GB/T 7409.3-2007《同步电机励磁系统 大中型同步发电机励磁系统技术要 求》第5.14条) 参考答案:A
第13题: [单项选择]What change is taking place at Elway Motors A. More sport utility models are being made. B. It is opening a facility in West Springfield. C. It is entering car markets overseas. D. Each factory is focusing on one product. 参考答案:D