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Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit?keyword=Ammonia and water absorption-type refrigeration unit 专利,更快更准确