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28w灯一天费0.672度电。28w=0.028kw,0.028kw/h一小时耗电为0.028度电左右,电功率为0.028kw,1度=1kw/h,即W=Pt,P=0.028kw;W=Pt=0.028kw×1h=0.028kw/h,所以28w...