These bulbs use a (17) of the electricity of standard bulbs and last eight times (18). Therefore, consumers can save about US$7 to US$21 per bulb. In Europe, there is a labeling sc...

Câu hỏi :

These bulbs use a (17) of the electricity of standard bulbs and last eight times (18). Therefore, consumers can save about US$7 to US$21 per bulb. In Europe, there is a labeling scheme for refrigerators, freezers, washing machines and tumble dryers.