manual control screw [机] 手调螺旋
Control screw rod 操纵螺杆
depth control screw 深度控制螺钉
horsepower control screw 功率控制螺钉
Screw Height Control 螺杆式高度调节器
screw depth control 螺杆式深度调节
control screw 控制螺钉
screw-pump control system 螺杆泵控制系统
width control screw 宽度控制螺杆
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