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
The Third Industrial Revolution began in ________
A. the USA
B. the UK
C. Germany
D. the Soviet Union
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