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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

Explosives (1), flammable gases (2.1), and flammable liquids (3) are the three hazard classifications that must be maintained in a trailer without automatic heating and cooling since they are the most volatile.