问题详情

Which statement is NOT true about the idea of switching time？
A．U.S. adapted the idea five decades after it was thought out.
B．Thanks to this idea, 1% of electricity was saved in 1970s.
C．It may not be a good idea when various electronics are used.
D．It is a good idea concerning diminishing energy used in lighting.请帮忙给出正确答案和分析，谢谢！