upper elevator screw bushing 升降机螺旋上端套
steel screw bushing 螺纹钢套
reverse-flight screw bushing 反螺纹套筒
screw and bushing [油气] 螺杆和衬套
screw shaft bushing 螺旋轴衬套
rear screw shaft bushing 后螺轴衬套
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