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A(n) ___ is a device worn over the ears to reduce the level of noise reaching the eardrum.

An automatic nonreturn valve is constructed of a piston in a cylinder with a stem and handwheel.

A(n) ___ is a device worn over the ears to reduce the level of noise reaching the eardrum.

One of the most common types of heat exchangers in industrial applications is a ___ heat exchanger.

One of the most common types of heat exchangers in industrial applications is a ___ heat exchanger.

All plants maintain boiler room logs for an 8-hour period.

All valves are opened during dry layup to prevent moisture from entering the boiler.

An igniter is a device used to set fire to the fuel in a burner.

Not all boilers use modulating control.

In a ___ system, the inlet temperature at each consecutive heating unit is lower than at the previous heating unit.