Bing Xu , Jun Shen , Shihao Liu , Qi Su , Junhui Zhang . Research and Development of Electro-hydraulic Control Valves Oriented to Industry 4.0: A Review[J]. Chinese Journal of Mechanical Engineering, 2020 , 33(2) : 29 -29 . DOI: 10.1186/s10033-020-00446-2

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