. Aviation components/aircraft equipment may contain dangerous goods that meet DGR standards. For example: explosives (flare-emitting signal), chemical oxygen generator, waste tire assembly, compressed gas cylinders, paints, adhesives, aerosols, life-saving equipment, fuel in equipment, first aid box, wet or lithium batteries, matches, etc.

2. Automobile accessories (small cars, engines, motorcycles) may contain wet batteries, nitrogen shock absorber brackets, air bag inflator/air bag components, engines, carburetors or fuel tanks with or without fuel, tire inflation devices with compressed gases, etc.

3. The respirator may have compressed air or oxygen cylinder, chemical oxygen generator or frozen liquid oxygen.

4. Camping/hiking equipment may contain flammable gases (butane, propane, etc.), flammable liquids (kerosene, gasoline), flammable solids (hexamine, matches, etc.), or other dangerous goods;

5. The vast majority of chemicals are dangerous goods and only qualified personnel with dangerous goods can consider whether they can be transported as goods. Hazardous chemicals must not be transported as luggage.

6. The COMAT aircraft components may be equipped with dangerous goods as part of the passenger service system, such as chemical oxygen generator, compressed gas, flammable liquids, corrosives, magnetic materials, etc.

7. Cryogenic liquefied gases may contain cryogenic liquefied gases, such as liquid nitrogen, liquid helium, liquid argon, etc. Cryogenic liquids are dangerous because skin contact with them can damage skin tissue, and once leaked in a narrow space, it can cause suffocation.

8. Gas cylinders may contain compressed or liquefied gases

9. Dental equipment may contain flammable resins or solvents, compressed or liquefied gases, mercury and radioactive materials.

10. Diagnostic specimens may contain infectious substances.

11. Diving equipment may have cylinders (e.g. underwater respirator tanks, backpack cylinders, etc.) which are usually filled with compressed gases or special gas mixtures, empty cylinders (pressure gauge reading is zero), diving lamps may have lead-acid rechargeable batteries, and high-intensity diving lamps may generate extreme heat when turned on in the air. In order to carry it safely, the batteries and light bulbs should be removed.

12. Drilling and mining equipment may contain explosives or other dangerous goods.

13. Liquid nitrogen tanks may contain free liquid nitrogen. Packaging in any direction is subject to these rules if they may release free liquid nitrogen.

14. Electrical equipment may contain magnetic materials, relay switches and electronic tubes may contain mercury, uninterruptible power supply (UPS) may contain wet batteries;

15. Point power equipment (wheelchair, mobile auxiliary equipment, lawn car, golf car) may contain wet batteries.

16. Photography and media equipment may be equipped with explosive pyrotechnics, generators of internal combustion engines, wet batteries, fuel and exothermic materials.

17. Frozen food may be packed in solid carbon dioxide (dry ice), which has adverse effects on human and animals.

18. Fuel control devices may contain flammable liquids.

19. Hot balloons may contain flammable gas cylinders, fire extinguishers, batteries, etc.

20. Household articles may contain hazardous substances, including flammable liquids, such as solvent-based paints, adhesives, polishers, gas solvents (passengers are not allowed to carry), bleaching agents, corrosive cans or sewer cleaners, ammunition, matches, etc.

21. The instrument may contain mercury barometers, manometers, mercury switches, rectifiers, thermometers, etc.

22. Laboratory test equipment may contain hazardous substances, especially flammable liquids, flammable solids, oxidants, peroxides, poisonous or corrosive substances.

23. Mechanical components may contain adhesives, paints, sealants, solvents, wetness and lithium batteries, mercury, compressed or liquefied gas cylinders, etc.

24. Magnetism and other similar materials may meet the standard of magnetic materials in the rules individually or jointly (demagnetization treatment is required).

25. Medical articles may contain hazardous substances, especially flammable liquids, flammable solids, oxidants, organic peroxides, poisonous or corrosive substances.

26. Metal building materials/metal pipes/metal Fences may contain magnetic materials, which should be loaded according to special loading requirements in order to avoid affecting aeronautical instruments.

27. Passenger luggage may contain items that meet the standards of dangerous goods, such as fireworks, flammable gases for household use, corrosive cans or sewer cleaners, flammable gases or liquefied inflatable cans for lighters, cylinders for camping stoves, matches, ammunition, bleaching agents, aerosols, etc.

28. Pharmaceuticals may contain hazardous substances, especially radioactive substances, flammable liquids, flammable solids, oxidants, organic peroxides, poisonous substances and corrosive substances.

29. Photographic equipment may contain hazardous substances, especially radioactive substances, flammable liquids, flammable solids, oxidants, organic peroxides, poisonous substances and corrosive substances.

30. Racing car or motorcycle team equipment may have engines, carburetors or fuel tanks, flammable solvents, compressed gas cylinders, nitromethane, other fuel additives or wet batteries, etc.

31. Refrigerators may contain liquefied or compressed gases.

32. The repair kit may contain adhesives, cellulose, paints, organic peroxides, solvents, resins, etc.

33. Samples sent for inspection may contain articles that meet the dangerous goods standard.