filament ground
... filament emission 灯丝发射 filament ground 灯丝接地 filament sag 灯丝垂弛度 ...
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中和阴极灯丝电源的正极接地，使得整个中和阴极灯丝处于负电位；
Anode of power supply for neutralization cathode filament is connected to ground, so that filament is at negative potential.
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