本文主要介绍罗克韦尔-AB公司采用最新6.5kv、800A功率器件——对称门极换流晶闸管(SGCT)生产的新型中压变频器工作原理、主要特点和功能.
新型CM1、CM1系列塑壳断路器具有高分断、短飞弧、多种保护功能.本文重点介绍该二种产品的主要技术性能.
Many students are short of exercise in their spare time now. On the one hand, they have too much homework to do after school. On the other hand, they ①probable have so many after?school classes such a
I have a few candles stored in a drawer in my dining room. Theyre put there for ro-mantic dinners or special parties. But as life becomes ordinary day after day
●句型梳理 1.Hows the weather in Beijing? “How is / was the weather...?”意为“……天气怎么样?”,常用来询问天气情况,weather后面可接时间或地点状语。对其回答时用“It is / was 表示天气情况的形容词”或“It is / was 现在分词”。例如: ①—How was the weather yesterday?昨天
在施工技术研究上,首先需对建筑工程深基坑支护施工技术进行要点的论述,并且还需对深基坑支护技术与基坑开挖空间的不足、实际承受能力不相符合、受地下水影响,对这些问题做
本文从新型高效电磁调速电机的结构、原理着手,分析用于风机、泵调速节电的理论依据.并且结合实际,比较各种调速方案的优缺点.提出了新型高效电磁调速电机用于风机、泵调速节
本文作者结合工作实际谈了使用AutoCAD的心得体会,供同行们交流.
The lifting technique is now the most popular tool for dealing with sampled-data controlsystems. However, for the robust stability problem the system norm is no
本文介绍了一种永磁冷阴极轴向缝引出的新型PIG离子源的设计、结构和初步实验结果.该原在放电功率低于100W情况下,O或N的束流大于10mA,O负离子束达mA级.