题目内容

( )are commonly used in motor control applications to start and stop motors.

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( )provide visual indication of the status for many motor-controlled processes permitting personnel at remote locations to observe the current state of the operation.

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

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.