Question

nccer 00109 - introduction to material handling
55min
where should materials never be stacked or stored?
on pallets
outdoors
on scaffolds
in cabinets

Explanation:

Scaffolds are temporary structures for construction workers. Stacking materials on them can cause instability and safety hazards. Pallets are standard for material storage. Outdoor storage (with proper cover) and cabinets (for smaller items) are common and safe in many cases.

Answer:

on scaffolds