When a freight truck transporting commercial lithium-ion battery packs experiences a cargo fire caused by thermal runaway (热失控), what is the critical fire suppression reality?

1. Thermal runaway generates internal oxygen and self-sustaining heat; dry powder extinguishers cannot extinguish the chemical reaction, and professional firefighters require massive, continuous water deluge cooling
2. A standard 1 kg ABC dry powder extinguisher will permanently extinguish lithium battery thermal runaway within 3 seconds
3. Throwing a dry blanket over the battery pack absorbs the heat and eliminates all toxic gases
4. Lithium battery fires produce zero toxic smoke and emit pure harmless water vapor