[Answer] When should sheets be changed?

Answer: whenever they are soiled wrinkled or damp
When should sheets be changed?

A bed sheet is a rectangular piece of cloth used either singly or in a pair as bedding being placed immediately below or above bed occupants. A top sheet in the many countries where they are used is a flat sheet immediately under which bed occupants lie. A bottom sheet is laid above the mattress and bed occupants lie on it. A bottom sheet may be either a flat sheet or a fitted sheet …

Sheet film is large format and medium format photographic film supplied on individual sheets of acetate or polyester film base rather than rolls. Sheet film was initially supplied as an alternative to glass plates. The most popular size measures 4×5 inches; smaller and larger sizes including the gigantic 20×24 inches have been made and many are still available today.

In finance a revaluation of fixed assets is an action that may be required to accurately describe the true value of the capital goods a business owns. This should be distinguished from planned depreciation where the recorded decline in value of an asset is tied to its age.. Fixed assets are held by an enterprise for the purpose of producing goods or rendering services as opposed to being …

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