预聚焦 meaning in Chinese

prefocusing

Types and dimensions of prefocus caps
预聚焦式灯头的型式和尺寸
Projection lamps , four - pin , prefocus , base - down type , dimensions for
四脚预聚焦灯头向下型放映灯的规格
Gauges of prefocus caps
预聚焦式灯头的量规
Projection lamps , condenser - reflector , four - pin , prefocus - base types , dimensions for
四脚预聚焦型聚光反射器的放映灯的规格
Electric lamps - tungsten - halogen lamps with gz9 . 5 two - pin , prefocus bases and 36 . 5mm nominal light center length
电灯. gz9 . 5双插头预聚焦灯座和36 . 5mm标定光源中心长度的卤钨灯