1. Synthetic carbon film resistor is a high voltage, high resistance resistor, usually with its outer layer sealed by a glass shell.

2. Synthetic carbon film resistors are made by mixing carbon black, fillers, and some organic adhesives into a suspension, spraying it onto an insulating skeleton, and then heating and polymerizing it.

3. The name designation of metal film resistors in circuits is usually "R" or "RH".

4. Metal film resistors are generally labeled with color rings to indicate their resistance values.

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