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... 所属州: OR 名字: Haak 姓: Dan ...
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This so-called 'bio-gas' is burned like natural gas in a small electric power plant right on Vander Haak's farm.
VOA : standard.2010.02.23
Five years ago, dairy farmer Darryl Vander Haak flipped the switch on the first electric generator in Washington State powered by manure.
is relatively cheap. Dairyman Vander Haak says his energy sales have not been profitable.
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