The structure of traditional centrifugal pump has cancelled the axis of the sealing device, reason can accomplish completely without leakage.
这种结构取消了传统离心泵具有的旋转轴密封装置，故能做到完全无泄漏。
2
The invention has the beneficial effects that the weight and the stress of the whole suspended ceiling are both evenly scattered on each frame and the old triangular keel structure is cancelled;
本发明的有益效果是：整个吊顶棚的重量和受力都均匀分散到每个框架上，取消了老式的三角龙骨结构；
3
The last single tracks was cancelled in 1949 and a new design of tram cars was introduced. Basically, this design of the structure of tram cars still retained today though the outlook was different.