Format factory conversion video format method How to convert video format

Generally speaking, the shelf life of antifreeze is two years. If it is a long-acting antifreeze, the shelf life will be longer, and it can be used for three to five years. See the product manual for details. If the shelf life is over but the antifreeze does not deteriorate, it can still be used.

Selection and purchase principles of antifreeze:

1. Select the freezing point of antifreeze according to the ambient temperature conditions. The freezing point of antifreeze is one of the most important indicators of antifreeze and an important condition for whether antifreeze can prevent freezing. Generally, the freezing point of antifreeze should be about - 10 ℃~15 ℃, the lowest temperature in winter under local environmental conditions. If the lowest temperature is - 30 ℃, the freezing point of antifreeze should be below - 45 ℃. If ethylene glycol mother liquor is selected for preparation, antifreeze solution with ethylene glycol concentration of 59%, freezing point of - 50 ℃ and density of 1.0786mg/m3 can be prepared.

2. Select antifreeze according to different requirements of the vehicle. Generally, permanent antifreeze (2-3 years) shall be used for imported vehicles, domestic imported production vehicles and high and middle grade vehicles. Direct use antifreeze can be used for ordinary vehicles, and softened water can be used in summer.

3. Select antifreeze according to the number and concentration of vehicles. Units and departments with more vehicles and relatively concentrated vehicles can choose small packages of antifreeze mother liquor. This antifreeze mother liquor has stable performance. Because of the use of small packages, it is easy to transport and store. At the same time, it can be flexibly modulated according to different environmental use conditions and different work requirements to achieve the purpose of saving and practicality. In the case of few or scattered vehicles, the full purpose antifreeze can be directly used.

4. Generally, antifreeze with rust prevention, corrosion prevention and scale removal capabilities shall be selected. The most important thing of antifreeze is rust prevention. Therefore, famous brand products should be selected. These products are added with preservatives, corrosion inhibitors, scale inhibitors and cleaning agents to ensure product quality.

5. Select the antifreeze that matches the rubber seal conduit. The antifreeze should have no side effects such as swelling and corrosion on the rubber sealing conduit.

Whole grain cereals include corn, rice, soybeans, oats, buckwheat and other foods.

1. Corn, also known as corn, corn cob, corn, pearl rice, etc. Originated in Central America and South America, it is an important food crop in the world, widely distributed in the United States, China, Brazil and other countries.

2. Rice is warm and wet in nature. It is commonly called "rice" or "millet" in southern China. Rice is the shelled grain. Rice is not only food, but also can be used as raw material for wine making and maltose making.

3. Soybean, originating in China, is cultivated all over China, and also widely cultivated all over the world. Soybean is one of the important grain crops in China. It has been cultivated for 5000 years. It was called Shu in ancient times. Northeast China is the main production area. Its seeds are rich in plant protein.

4. Oat is a worldwide cultivated crop. However, the main production areas are temperate regions in the Northern Hemisphere. Love the cold and dry climate. The grain of oats is used for grinding flour or as feed, which has high nutritional value.

5. Buckwheat has formed a variety of consumer uses. There are many kinds of food and medical products processed from buckwheat, mainly including rice and flour, tea drinks, seasoning, alcohol, health products, medicine and pharmaceutical raw materials, which are very popular.