电力线路(或电网)的额定电压等级是国家根据 国民经济发展的需要 及电力工业的水平 ,经全面 技术经济分析后确定的。
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发电机的额定电压高于同级线路额定电压 5%
A. 对
B. 错
当变压器一次绕组直接与发电机相连时,其额定电压高于电网额定电压5%
A. 对
B. 错
The First Industrial Revolution is marked with_______
A. steam power
B. electricity
C. automobile
Britain’s dominance in economy was challenged for the first time in ______.
A. The First Industrial Revolution
B. The Second Industrial Revolution
C. The Third Industrial Revolution
D. After World War Ⅱ