What is the 4th wire for on the processor fan?

什么是处理器风扇的第4线？

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Lifts and service lifts. drawn steel wire for elevator ropes. specifications.

载客电梯和货梯。电梯缆索用冷拔钢丝。规范。

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The article introduces the trial production process and technology of steel wire for steel wool.

介绍了钢棉用钢丝试制过程及生产工艺。

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