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What is the missing symbol in the following nuclear transformation? +
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Tachometer
An instrument used to measure the rotation speed of a shaft or disk, as in a motor or other machine.
Solenoid
A type of electromagnet where the core is moved by the magnetic field when electrical current flows through the coil surrounding it, often used to control valves or actuators.
Actuator
An output device normally connected to an output module. Examples are an air valve and cylinder.
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