Electricity is like water, . It flows from the wire to our homes.
A:in a way
B:on the way
C:by the way
如图,AB是⊙O的直径,弦CD⊥AB,垂足为E,如果AB=20,CD=16,"那么线段OE的长为()
如图, 电源电压U 保持不变, 开关由闭合到断开时,电流表的示数将( )