They are used to enhance the gain of amplifier and realize the impedance matching, improve the current copying precision, decrease the tolerance of voltage gain.
它们用于提高放大电路的增益和实现输出阻抗匹配，提高电流复制精度，减小电压增益误差。
Level3: Tolerance matching of freewheel bushings. Factory only.
级别3：飞轮轴套的公差矫正。只有工厂可以操作。
Level3: Tolerance matching of freewheel bushings. Factory only.
级别3：飞轮轴套的公差矫正。只有工厂可以操作。
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