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The difference between a push button and selector switch is( ).

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A( )is one that is controlledautomatically by factors such as pressure, position, andtemperature.

( )are devices that are used to detect, and often to measure, the magnitude of something.

Photoelectric sensors are composed of two basic components: a transmitter (light source) and a ( ).

An( ), in the electrical sense, is any device that convents an electrical signal into mechanical movement.