Most of the old buildings in Europe were destroyed in the Second World War, but the grand buildings that their forefathers built in Shanghai have survived.
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Shanghai Customs Building was built in 1927. The clock on top of the building strikes every 50 minutes.
A. 对
B. 错
二次回路中,TV或YH表示( )。
A. 断路器
B. 电压互感器
C. 电流互感器
D. 熔断器
二次回路中,SA表示()。
A. 按钮
B. 连接片
C. 控制开关
D. 接触器
二次回路中,FU表示()。
A. 断路器
B. 电压互感器
C. 电流互感器
D. 熔断器