Which of the following is a cluster of symptoms that occur 3 to 14 days preceding men-struation and is relieved by its onset?

Advantages of O2 concentrators for home O2 therapy include which of the following? 1. Operate at safe low pressures. 2. Are cost-effective for continuous use. 3. Do not waste or lose any O2. 4. Can power most pneumatic equipment

a. 1 and 3 only b. 1, 2, and 3 only c. 3 and 4 only d. 2, 3, and 4 only

Which of the following is the measure of volume in the English system of measurement?

A. pound B.pint C.liter D.centimeter