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Question:

Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater/air conditioner unit)?

A Classes 1, 2.1, and 3
Explaination

The three hazard classes that must be kept in a trailer without automatic heating and cooling are: explosives (1), flammable gases (2.1), and flammable liquids (3), as they are particularly volatile.