During which phase of product development do companies introduce their product model to actual customers

screening/evaluation
business analysis
market testing
commercialization

Many dental offices prefer preset trays because the use of these trays or what

If you are caught in a flash flood, or sea water rushing your way, drive to the ground you can find. highest lowest nearest darkest

Knowing if a patient has tuberculosis, hepatitis b, or aids is important because a. serious illnesses should be avoided. b. they could compromise the vital sign readings. c. cross-infection may occur. d. they can't be cured.