In addition to drinking, is there no other use for cola? Of course not. In fact, there are many uses for cola, but you haven't found it yet. Now I will introduce you to other uses of cola! Can be used to clean the burnt pot. Pour the cola into the boil and remove the burnt material from the bottom of the pot. Hair dye

Signal Relay

Signal relay is a common device in the automatic control system. It is generally used to connect and disconnect the circuit, issue control commands and reflect the status of the equipment by dropping the card, and remove the signal by returning the signal card after the equipment restores to normal. It is an important part of the automatic control and remote control circuit.

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