Elevator hoistway enclosures usually are required to have a fire rating of ___ hours

When performing an immediate spin crossmatch, a suggested procedure is to add one drop of 3-5% saline washed donor red blood cell suspension to ____ drop(s) of recipient plasma in a test tube

a. one b. two c. three d. four

__________________ is a term used to describe any unreasonable behavior on the part of the patient that contributed to the cause of injury

a. Contributory negligence b. Comparative negligence c. Assumption of risk d. Affirmative duty