n.四极管
A tetrode with grid and plate potentials so arranged that plate current decreases when plate potential increases. 负耗阻性管由栅极和极板电势组成的四极管，其中当极板电流降低时极板电势反而增加
Technical improvement of making rotary tube furnace,tetrode reduction furnace in recent years is described. 介绍了近年来在制作回转管炉、四管还原炉的技术进步；
reverse blocking tetrode thyristor 反向阻断四极硅闸流管
A report of 20 cases of peripheral tetrode drainage in the treatment of acute fatal pancreatitis 胰周四管引流治疗急性重症胰腺炎20例报道
Experimental Methods of Adjustable Tetrode Array Neurophysiology, January (IAP) 2001 2001一月(自由活动月)课程:神经生理学可调变四极管阵列的实验方法
