Knowledge of drowning prevention safety education for primary and secondary school students 001 Key Points of Swimming Safety　　 1.Don't be too hungry or full when you go into the water.Only one hour after meals can it go into the water to avoid cramps. 2.Try the water temperature before launching. If the water is too cold, don't go into the water. 3.If you swim in rivers, rivers, lakes and seas, you must accompany and not swim alone. 4.Watch the environment of the swimming place before launching. If there is a danger warning, you can't swim here. 5.Don't swim in canyons where the geographical environment is not clear.These places have different depths of water and are cold. There may be harmful obstacles in the water, which is very unsafe. 6.Before diving, make sure the water is at least 3 meters deep and there are no weeds, rocks or other obstacles underwater.It is safer to enter water first by foot. 7.When swimming in the sea, you should swim parallel to the coastline. If you are not skilled or physically strong, you should not wade deep into the water.Make a mark on the coast to see if you have been washed out too far, adjust your direction in time to ensure safety. 2. How to prevent lower limb cramps in swimming 　　 Warm-up exercises must be done before swimming. Before swimming, you should consider your physical condition. If you are too full, hungry or overtired, don't swim. Pull some water on your limbs before you swim, and then jump into the water.Don't jump into the water immediately. When swimming, if you have chest pain, press your chest hard, and then go ashore when it's better. When abdominal pain occurs, you should go ashore and drink some hot drinks or soups to keep your body warm. 3. Summer swimming drowning self-rescue strategy 　　 How to ensure the health and safety of swimming and avoid the occurrence of drowning? It is very easy to cause life danger if you rush into the water when you are not familiar with the water.In case of a drowning accident, experts recommend that Drowners should not panic and should remain calm and actively save themselves: (1) For the hand and foot cramps, if the fingers cramp, you can clench your fist, then stretch it out, quickly repeated several times, until the cramp is eliminated; (2) If the leg or toe cramps, first take a breath and float on the water. Hold the toes of the cramped limbs with the opposite hand of the cramped limbs, and pull them in the direction of the body. At the same time, press the same hand on the knee of the cramped limbs to help the cramped limbs straighten out. (3) If thigh cramp occurs, it can be solved by stretching the muscle. For drowning victims, besides active self- rescue, they should also actively carry out land rescue: (1) If there is mud, weeds and vomit in the mouth and nose of drowning people, they should be cleared first to keep the upper respiratory tract unobstructed. (2) If the drowned person has drunk a lot of water, the rescuer can kneel on one leg, bend the other leg, put the drowned person's abdomen on the knee-bending thigh, hold the drowned person's head with one hand, press his mouth down, the other hand on the back, so that the water can be discharged; (3) If the drowning person is unconscious and breathes weakly or stops breathing, artificial respiration should be carried out after the above treatment.It can make the drowning person lie on his back. The rescuer holds the drowning person's nose with one hand beside him, and holds his jaw with the other hand. He takes a breath and then blows the air into the drowning person's mouth with his mouth.After blowing a breath, leave the drowning person's mouth, at the same time release the hand that pinches the nose, and press the drowning person's chest with the hand to help him breathe out.So regularly repeated, about 14 - 20 times per minute, starting slowly, later can be properly accelerated. IV. Emergency Drowning Treatment　　 Drowning is a common accident. Drowning can cause asphyxia and hypoxia. If the heart stops, it is called "drowning". If the heart stops, it is called "near drowning". The classification of "near drowning" is of great significance in estimating the condition and prognosis. However, the principles of treatment are basically the same, so it is collectively referred to as drown