unified miniature screw thread
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
3-phase unified power quality conditioner(UPQC)
3-phase unified power quality controller (UPQC)
a class of unified chaotic system
a unified plan for rural and urban development
a unified technology combining heat treatment and plastic forming