There are many sorts of the modern dredgers , to adapt the various working regions , and soil conditions etc . it is inevitable to select to build the large self - propelled trailing suction hopper dredgers for shanghai channel bureau , because of the developments of the big - scale ports and channels at home and abroad , and the bad working conditions offshore , and the business direction 现代挖泥船有各种类型，它们适用于不同的施工区域与土质等工况条件。世界与国内港口航道的发展愈来愈体现出规模大，向外海推进和施工条件恶劣的特征，从上海航道局的企业经营定位出发，建造大型自航耙吸挖泥船是首选方案。
Following the rapid development and the increasing popularization of internet technologies since the middle of 1990s , intranet , the application of internet technologies in firms " internal management systems , has become the first choice of information handling to increase operation efficiency in all industries 90年代中期以来，随着internet技术的飞速发展和日益普及，将internet技术应用于企业的内部管理系统，即构造企业的intranet正成为各行业进行信息化建设，提高企业运作效率的首选方案。
New standards from ieee brings not only the full support on criterion but also the improvement on the ethernet technology , endues it with virtues such as easy to use , low cost of price and high - speed etc . ethernet has entered the domain of metropolitan area network ( man ) and wide area lan ( wan ) 以太网开始进入城域网man和广域网wan领域。目前， g位以太网已经成为宽带ip城域网的首选方案，也已经开始用于并将广泛用于man和wan 。随着千兆以太网技术的继续发展，对网络管理的要求也相应增加。
