2. 外语
  3. The processing of sewage(污水) requires considerable amounts of electricity. Many sewage treatment plants in the U.S. have become

The processing of sewage(污水) requires considerable amounts of electricity. Many sewage treatment plants in the U.S. have become

admin2008-11-13  37
问题 The processing of sewage(污水) requires considerable amounts of electricity. Many sewage treatment plants in the U.S. have become self-sufficient by using the methane gas (沼气)given off by sewage.
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答案污水处理需要大量的电。美国的许多污水处理厂通过使用污水排放出的沼气实现电的自给自足。
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