How often should portable fire extinguishers be removed from service for maintenance?

_______ are internal points of reference used to differentiate between what is good and what is bad

A) Values B) Morals C) Ethics D) Bioethics

Private dry-barrel hydrants must drain completely in what amount of time?

A. No less than 30 minutes B. No more than 1 hour C. 2 hours D. 4 hours