Which type of aircraft can be fitted with a variety of application devices, including centrifugal spreaders?

The type of aircraft that can be fitted with a variety of application devices, including centrifugal spreaders, is typically fixed-wing aircraft. These aircraft are designed for agricultural applications and are versatile in their configuration. They can accommodate various application equipment such as aerial spray systems, centrifugal spreaders, and other devices that allow for effective distribution of pesticides and fertilizers over large areas.

Helicopters, while also used in aerial application, generally have limitations in the types of application devices they can carry compared to fixed-wing aircraft. They are more commonly used for specific applications where precision is crucial, but they do not frequently employ centrifugal spreaders.

Blimps are not generally utilized for aerial application due to their size and control limitations, making them impractical for pesticide or fertilizer distribution.

Thus, fixed-wing aircraft are the correct answer, given their flexibility and capability in outfitting multiple application devices, including centrifugal spreaders, for effective aerial application.