American standard screw thread
cutting the screw thread
screw thread
螺纹节距
螺纹联结
螺纹副
螺丝牙
螺旋机构
螺柱
螺纹
数控编程
跨线测量
single-line regular screw thread
technology of straight screw thread joint
unified miniature screw thread
abundant and coarse sediment area
abundant and coarse sediment area of north Shaanxi
air voids of coarse aggregate