To avoid liability of restoring sprinkler systems, some fire departments do not replace heads and restore the system.

Class B low-expansion foams in use today are designed to be used at 1-percent, 3-percent, or _____ concentrations.

A. 6-percent B. 8-percent C. 10-percent D. 12-percent

The force that causes fluids to flow into tubes with small diameters is:

A. capillary action. B. hemolysis. C. clotting. D. centrifugal force.