Autumn cream, also known as early frost, first frost. Frost is one of the major natural disasters in counties of Chengde City. Each year it causes losses of varying degrees, especially in the three counties in the north. In general, the northern part of the country will see frost in late September, and the upper part of the dam will see frost in early September (the end of August in individual years). The middle part sees frost in early October, and the southern part is a little bit more 1-2 days later than the middle part. For large areas of frost protection, there are still some difficulties, and measures such as selecting and breeding good breeds, adapting measures to local conditions, and rational distribution should be adopted. Here are some common and effective methods for reference. 1) Covering anti-frost: When forecasting frost at night, cover plants. When using thin films, it is best to be opaque and reflective. Or use the leftovers of the slaughtered animals to make foaming agents sprayed on the plants to form foam, cover the plants, and provide insulation. 2] Spray water anti-frost: The heat capacity of water is very large, and the water that is higher than the temperature of the plant falls onto the plants, which can increase the body temperature and release latent heat when the water is frozen. Note that it is best not to stop spraying, stop when the sun comes out, prevent ice formation, and increase freezing damage. 3] Heated anti-frost: burning various combustibles to heat air and plants. When radiation frost and flow frost occur, there is an inversion layer near the ground, and evenly and slowly heating, and the lower air can increase the temperature of the plant, preventing Frost damage occurs. 4) Smoke anti-frost: Slowly burning smoke, ignition in the wind, heat release air, smoke contains a large number of hygroscopic particles, condensation condensation release heat. 5] Perturbation resistance: It is to make static air flow and mix up and down. Everyone knows that there is generally no frost in nights with strong winds. This is the reason. According to reports, the use of helicopters abroad, ultra-low air to do "8" type flight several times, will be able to solve the problem of frost. Of course, we do not have such conditions at the moment, but with the rapid economic development, we may as well try.
Head blocks, base board and chin and head straps all are the accessories of the Head Immobilizer. They are made of high density foam and water repellent coating. Easy to clean and not absorb blood or bodily fluids. Firm control of head movement is provided while helping to maintain proper cervical spine alignment without causing patient discomfort.
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