There Are Three Basic Methods of Operating a Photo Switch

question 8

True/False

There are three basic methods of operating a photo switch: thru-beam, retro-reflective, and specular.

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Definitions:

Mainland

The principal landmass of a country or continent, as distinguished from islands or peninsulas.

Island Chain

A series of islands closely located, often formed by volcanic activity, which can be found in oceans and seas around the world.

Economic Service

Services that lead to the production of economic value, including industry, banking, transportation, and any service contributing to the economy.

Wild Species

Plants, animals, and organisms that grow or live wild in an area without being introduced by humans.