【简答题】More and more carbon dioxide from burning the coal and oil is (5) ________ into the air every year. The carbon dioxide can absorb the heat from the earth. The more carbon dioxide in the air, the more ...
【简答题】将下列段落翻译成中文 Geothermal heat pumps, which use the earth as a heat sink in the summer and a heat source in the winter are viable nationwide.Therefore,they rely on the relative warmth of the earth for the...