Correct answer
An insulated vehicle with a heat-producing device.
It is an insulated vehicle with a heat-producing device that raises the temperature inside the body and then maintains it at a practically constant value. This differs from a mechanically refrigerated vehicle producing cold with compression or absorption equipment, and a refrigerated vehicle using another cold source.
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An insulated vehicle with a heat-producing device.
An insulated vehicle producing cold with mechanical compression or absorption equipment.
An insulated vehicle using a cold source other than mechanical or absorption equipment.
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