GLOBAL 3000 | Biogas for China's Farmers
3:59
Added: 3 years ago
From: deutschewelleenglish
Views: 1,304
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  • how is it possible for a little tube like that can generate that pressure in gas.

    eastern2western 9 months ago

  • thanks for this video, i really need it...

    samueldelgado 3 years ago

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