It makes introduction to the basic working principles and main technical data of the intelligent type circuit-breakers especially it has made a break through in a new design method for R & D of large capacity and ultra large capacity circuit-breakers .

介绍了智能 型断路器的基本工作原理和主要的 技术 数据，特别是对大容量和超大容量断路器的研制闯出了新的设计方法。

The structure and operating principles technical data test records type selection and demands in installation and actual application of German Q series quantometers are described .

介绍德国Q系列燃气表的结构及工作原理、 技术 数据、试验记录、 选型与施工要求、实际应用。

The paper describes the main technical data principle structure and design feature of No. 5 and No. 6 Pull Type Disc Cooling Beds of No.

介绍了柳钢中板厂技术改造中的第二精整线5、6滚轮拉钢 式冷床的主要 技术 参数、原理结构和设计特点。