DBT支架立柱立柱
hydraulic cylinder of DBT roof support
分立位置表象
Discrete position presentation
全位置立向下电焊条
whole position vertical down welding electrode
全位置立向下焊
All Position and Vertical Down Welding
伺服机构阀中立位置调整
servo valve neutral adjustment
伺服机构阀中立位置调整螺钉
servo valve neutral adjustment screw
伺服机构控制中立位置调整
servo control neutral adjustment
伺服机构中立位置调整试验孔口
servo valve neutral adjustment test port