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Дүүргэгч бутлах утгын туршилт дээр ppt
Халбагаар бутлах криоген Ppt. PowerPoint Presentation. Let''''s Talk Plastic Free plastic bags are too expensive United States uses 100 billion plastic bags per year: = 12 million barrels of petroleum or 504 million gallons = 4 billion/year cost passed onto consumers 13 bags = petroleum to drive 1 mile Plastic bags take 400 1,000
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