单项选择题

我国电力网络目前的额定电压主要有:( )。

A. 3.15kV,6.3kV,10.5kV,35kV,110kV,220kV,500kV
B. 3.15kV,6.3kV,10.5kV,35kV,116kV,300kV,500kV
C. 3kV,6kV,10kV,35kV,110kV,220kV,500kV
D. 3kV,6kV,10kV,37kV,110kV,220kV,300kV