Practice question

Which classes should not be loaded in trailers with heater or air-conditioner units that may create heat?

  1. Only Class 9
  2. Only nonhazardous freight
  3. Only empty pallets
  4. Class 1 explosives, Class 3 flammable liquids, and Division 2.1 flammable gases

Answer: D — Class 1 explosives, Class 3 flammable liquids, and Division 2.1 flammable gases

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