Thermionic emission refers to the release of electrons from the target material during the process of incandescence

________ Internet websites should NOT be used for help with a job search

Indicate whether the statement is true or false

Which type of ventilation system provides a supply of clean air and reduces contaminants and fumes from the OR?

a. negative, bidirectional b. negative, unidirectional c. positive, bidirectional d. positive, unidirectional