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"All devices, appurtenances, appliances and apparatus intended to serve some special function, such as sterilization, distillation, processing, cooling, or storage of ice or foods, and that connect to either the water supply or drainage system, must be provided with protection against ________________________ of the water supply system and stoppage of the drain. A. backflow contamination B. flooding contamination C. fouling, contamination D. All of these!"

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