高压大流量电比例控制组合应用（特别送给 液压哥！）

Impossible, because I don't have any info. As well, aerospace hydraulic control is special, core and security technology for Parker, so it's difficult for Parker Chinese team to learn anything from Parker USA, as you know, for China C919 big flight project, USA engineering support on this project direct and bypass Parker China engineering department, this was the truth, thank you for understanding!