避雷器的作用是什么？
参考答案：
避雷器是用来限制过电压，保护电气设备的绝缘免受雷电和操作过电压的危害
It is well known that Germany’s car industry is ______ its beer.
A．as a symbol much as
B．as much a symbol as
C．so much the symbol as
D．so the symbol much as
蹩压法是怎样进行井下泵况诊断的？
