All solvent waste, oily rags, and ___ shall be kept in fire-resistant covered containers until removed from the worksite.

Flammable liquids are substances that can easily ignite and sustain combustion, making them particularly hazardous in work environments, especially in conjunction with other materials like solvent waste and oily rags. Storing these materials in fire-resistant covered containers is a critical safety measure to minimize the risk of fires and explosions on the worksite.

This practice aims to contain any potential ignition sources and prevent the materials from coming into contact with sources of flame or spark. It aligns with safety protocols that prioritize the well-being of workers and the integrity of the worksite. While other materials like paper and scrap wood may also pose fire risks, the emphasis on flammable liquids highlights their specific volatility and the heightened measures required to safely manage them.