Dual pipe air supply systems were also added in DF 11 locomotives as a mainspeed up locomotive, and the relevant renewal of this type at depots were conducted.
东风11型机车作为提速的主型机车也加装了双管供风系统，并对在段的该型机车进行了相应的改造。
2
The cause of cracks after brush-plating on the mainspeed reducer of helicopter was analyzed and the ameliorative measures by shot-peening were brought forward consolidation.
分析了直升机主减速器齿轮电刷镀修复后产生裂纹的成因，通过试验提出了喷丸强化改进措施。
3
The designed top speed is 250km/h. These trains have been widely used for main city, such as Beijing, Shanghai, Suzhou and Shenzhen, Guangzhou.