?碟封三极管

... (N)Lighthouses of the world 世界各地灯塔 World's Most Beautiful Lighthouses 世界上最漂亮的灯塔 disk-seal triode (=lighthouses tube) 碟封三极管 ...

?盘封三极管

... disk-magnet motor 盘形磁钢电动机 disk-seal triode 盘封三极管 disk-shaped insulator 盘形绝缘子 ...