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[" of source be changed to increase the efficiency by "10%" of the original."u_(y)=1-(8v)/(7)],[" Refrigerator A works between "-10^(@)C" and "27^(@)C" while refrigerator "B" works between "-27^(@)C" and "17^(@)C" both "],[" removing heat equals to "2000J" from the freezer,which of the two is batter refrigerator."]

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