They work by using a kind of man-made greenhouse gas called Freon (氟里昂), which is far more damaging than carbon dioxide. Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity....
(EPA). Thomas Midgley, an American engineer and chemist, researched safer options in 1926 and found that compounds containing fluorides appeared to be a great deal safer. Chlorofluorocarbons (CFCs), marketed by DuPont as Freon, grew in popularity, until the compounds were found to be harmful to...
They work by using a kind of man-made greenhouse gas called Freon (氟里昂), which is far more damaging than carbon dioxide. Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity....
Lies can never changes fact. 谎言终究是谎言。 Lies have short legs. 谎言站不长。 Life is but a span. 人生苦短。 「> f Life is half spent before we know what it is. 人过半生,方知天命。 Life is not all roses. 人生并不是康庄大道。 Lite without a friend is death. 没有朋友,虽生...