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人文科學(xué)

        a lamp【問】 The gas-filled tungsten filament lamp is more of a furnace than a lamp. Since it uses ninety per cent of the power to produce unwanted heat and uses only ten percent to makelight.[原譯]這種充氣鎢絲燈與其說是一盞燈,不如說是一個(gè)火爐。因?yàn)樗娜?0%的電能去......（本文共 840 字）     [閱讀本文] >>