500kV支柱绝缘子的干弧距离不应小于( )。
A．2500mm； B．3800mm； C．4300mm； D．4550mm。
参考答案：B
----I don’t suppose the police know who did it.
----Well, surprisingly they do. A man has been arrested and _____ now.
A．has being questioned
B．is questioning
C．has questioned
D．is being questioned
遇有下列哪些情况不能办理越站？
