Briefly describe how to use a portable dry powder fire extinguisher.

1) Before using a fire extinguisher, it is necessary to check whether the pressure is valid； 2) Swing the fire extinguisher up and down several times with force ； 3) Remove the safety pin, hold the handle with one hand and the nozzle with the other, quickly move to a distance of about 1.5 meters from the fire, aim at the base of the flame, and press the switch firmly until the extinguishing agent is released ； 4) Sweep from afar to near, left and right, while moving forward to extinguish the fire ； 5) Once the fire is extinguished, immediately release the handle so that the extinguishing agent stops spraying ；

1) Before using a fire extinguisher, it is necessary to check whether the pressure is valid； 2) Turn the fire extinguisher upside down and shake it vigorously several times ； 3) Use the right hand to remove the safety pin, hold the handle with the left hand, and grip the nozzle tightly with the right hand. Move quickly to a distance of about 1.5 meters from the fire site, bend your legs into a bow shape, aim at the base of the flame, and press the switch firmly until the fire extinguishing agent is sprayed ； 4) Sweep from afar to near, left and right, while moving forward to extinguish the fire ； 5) Once the fire is extinguished, immediately release the handle so that the extinguishing agent stops spraying ；

First, carry it to the fire site (a small fire), staying at a distance of about 1.5 meters; remove the safety pin, hold the nozzle with the left hand, aim it at the base of the flames, and press the switch handle with the right hand.

1. When using a portable dry powder fire extinguisher, hold the handle of the extinguisher and rush to the location of the fire quickly. 　　 2. Place the fire extinguisher about 5 meters away from the point of ignition. When used outdoors, it should be positioned in the upwind direction. 3. Before use, invert the fire extinguisher several times to loosen the dry powder inside the cylinder. 4. First, remove the safety pin; hold the bottom of the bottle with one hand, and use the other hand to press down on the trigger, causing the dry powder to be sprayed out from the nozzle. 5. When using a dry powder fire extinguisher to put out a fire involving spilled liquids, spray from the side of the flame, aiming at its base, and move from near to far while sweeping left and right, advancing rapidly until the flame is completely extinguished. 6. When using a dry powder fire extinguisher to put out a fire involving flammable liquids in a container, it is also necessary to aim at the base of the flame from the side facing the flame, sweeping back and forth. When the flame is driven out of the container, move forward quickly to extinguish all remaining embers. When extinguishing a fire, care should be taken not to direct the nozzle straight at the liquid surface, to prevent the force of the dry powder stream from causing the oil to splash and thereby intensify the fire, making it more difficult to put out. 7. When using a dry powder fire extinguisher to put out fires involving solid materials, aim the nozzle at the area where the fire is most intense and sweep it from side to side; strive to apply the dry powder evenly over the surface of the burning material until the fire is completely extinguished. 8. When using a dry powder fire extinguisher, it is important to keep it in an upright position throughout the firefighting process; it must not be used in a horizontal or inverted position, as this will prevent the powder from being discharged ； At the same time, be careful to prevent re-ignition after using a dry powder fire extinguisher, as its cooling effect is minimal; in the presence of hot residues at the site of the fire, re-ignition can easily occur after extinguishing the fire.

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