The ____ accountability system is described as "a crew-card system that is tracked on a status board by a monitor."

An ideal heat and moisture exchanger (HME) should have an efficiency rating of at least which of the following?

a. 30% b. 50% c. 70% d. 90%

There are ____ ways to do a flow test in a pressurized system.

A. two B. three C. four D. five