读印度地理简图,完成下题.
We ____ ____ friends since we met for the first time.
如图所示,理想变压器的原线圈接u=11000 2 sin100πt(V)的交变电压,副线圈通过电阻r=6Ω的导线对“220V/880W”的电器RL供电,该电器正常工作.由此可知( )