In what sequence do the parts of a placard representing flammable liquids appear?

The correct sequence for the parts of a placard representing flammable liquids is 3, 2, 1. This order is based on the standard design utilized for hazardous materials placarding, which includes the following components:

1. The color of the placard, which is typically orange or red, signifies that the material is flammable.

2. The numerical classification, which indicates the degree of danger associated with the flammable liquid. It typically ranges from 0 to 4, with higher numbers indicating greater hazard.

3. Symbols or pictograms that represent the type of hazard more clearly (e.g., flames, explosion signs).

Understanding this sequence is crucial for first responders and others who need to quickly and accurately identify the type of hazardous materials they are dealing with. It allows for prompt and appropriate responses to incidents involving flammable liquids, thereby enhancing safety and efficiency in emergency situations.