Which of the following types of floors can be laid directly onto a soil subfloor?

The incubation period for a hepatitis B liver infection is ________ days

a. 15 to 30 b. 30 to 60 c. 60 to 90 d. 90 to 120

Which of the following is the primary reason why ambulances should have two oxygen supply systems?

A) To provide oxygen to two patients at one time B) To have a backup system in the event of failure of the primary system C) To ensure a supply of oxygen for long-distance transports D) To provide oxygen to the patient in the event of vehicle breakdown