... unipotential cathode 单电位阴极... unipotential electrostatic lens 单电位静电透镜... unipotential emittering surface 等电位发射面...
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equidiameter three-cylinder electrostatic unipotential lens 等径三圆筒单透镜
equi-diameter three-cylinder electrostatic unipotential lens 等径三圆筒单透镜
equi-diametral three-cylinder electrostatic unipotential lens 等径三圆筒单透镜
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