Mushrooms - dehydration method;

1. Bacon and cooked food - sun-drying and smoking methods;

Preserved fruits - osmosis preservation method, using sugar The solution removes the moisture from the fresh fruit;

Salted fish - pickling method, uses a salt solution to remove the moisture from the fresh fish. These methods are based on the principle of removing moisture to prevent the growth of bacteria and fungi.

2. Bagged milk, boxed milk, sausages - Pasteur sterilization method, based on the principle of high temperature sterilization.

3. Bagged meat sausage - vacuum packaging method, based on the principle of destroying the living environment of aerobic bacteria.

4. Meat canning - canning method, based on the principle of high temperature sterilization and preventing contact with bacteria and fungi.