The slide electrode of tri-electrode is just for shielding, and this structure can reduce the requirement of manufacturing tolerance;
三极板结构中动极板仅起屏蔽作用，可以降低对尺体导轨加工精度的要求；
The slide electrode of tri-electrode is just for shielding, and this structure can reduce the requirement of manufacturing tolerance;
三极板结构中动极板仅起屏蔽作用，可以降低对尺体导轨加工精度的要求；
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