Traditional Culture Encyclopedia - Traditional stories - The following are not modern methods of food preservation ( ) A. Air-drying B. Dehydration C. Freezing D. Adding preservatives
The following are not modern methods of food preservation ( ) A. Air-drying B. Dehydration C. Freezing D. Adding preservatives
| A．Air-drying refers to the method of drying in natural circulating air without direct sunlight． It is a primitive way of preserving food． B. B, dehydration refers to rely on gravity or mechanical force to reduce the water in the material method, there is a frozen water sublimation dehydration or low-pressure dehydration, are modern processes. More applied to the preservation and processing of aquatic products, does not meet the meaning of the question. C, freezing, also known as "refrigeration", is the application of thermodynamic principles, the use of artificially low temperatures to inhibit the growth and reproduction of microorganisms, belonging to the modern preservation technology, does not accord with the meaning of the question. D, add preservatives, preservatives are a class of chemicals that can prevent food spoilage, belonging to the modern science of preservation technology, does not meet the meaning of the question. The choice: A |
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