Correct answer
Mechanically refrigerated: with mechanical-compression or absorption refrigeration.
Mechanically refrigerated (frigorífico) under Annex II of the General Vehicle Regulations. It combines an insulated body with a mechanical-compression or absorption refrigeration unit. A non-mechanically refrigerated vehicle (refrigerante) uses another cold source; insulation alone limits heat transfer through insulated walls. Although a frigorífico is also insulated, the question asks for its specific classification with refrigeration equipment rather than that general property.
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Non-mechanically refrigerated: with a cold source other than those units.
Insulated only, without a refrigeration unit.
Mechanically refrigerated: with mechanical-compression or absorption refrigeration.
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