What should not come into contact with the interior parts of electrical equipment?

The choice indicating that abrasives should not come into contact with the interior parts of electrical equipment is valid because abrasives can cause damage to sensitive components. The interior of electrical devices often contains circuit boards, wiring, and other fragile elements that require protection from scratches and wear. Abrasives can create particles that may compromise the integrity of these components, leading to failure or malfunction of the equipment.

In contrast, while water, dirt, and lubricants can also pose risks to electrical equipment, the context of their potential effects differs. Water can lead to short circuits, dirt can interfere with connections, and certain lubricants are designed to reduce friction and wear on moving parts if used appropriately. However, abrasives are especially harmful because they can directly score and degrade the surfaces of crucial internal parts, making their contact particularly undesirable.