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Transformers do not actually make conversion between mechanical and electrical form, but they transfer electric power from one circuit to another circuit. They can decrease or increase the voltage while transferring the power without changing the frequency, but with the corresponding increase or decrease in the current. Transformers also belong to electrical machines.
The personnel of the duty station authorized to set up the checkpoints shall show the highway inspection certificate issued by the general office of the provincial people's government and wear industry inspection marks when performing the inspection tasks. Without the above certificates and marks the illegal inspection.
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