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%
查看答案
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
Which statement is NOT the feature of the Second Revolution?
A. development of electricity
B. the use of chemicals and automobiles
C. mass production
D. semiconductors
微信支付 
支付宝支付