Pole-changing adjustable-speed  变极调速

pole changing speed control  变极调速

pole-changing speed governing  变极调速

variable pole adjustable speed motor  变极调速电机

Two-speed pole-changing motor  变极调速

frequency and speed changing  变频调速

Frequency Changing and Speed Adjusting  变频调速

Frequency Changing and Speed Regulating  变频调速

adjustable-voltage and adjustable-speed  调压调速

anchor pole and rope  锚杆锚索

Automatic pole changing  自动换极

cart and pole  倒立摆

Cart and pole control system  倒立摆模糊控制系统

change-pole speed-adjusting  变极调速

Design of Steel Pole and It’s Application  钢管杆的设计与使用

foundation of pole and tower  杆塔基础

Ground Resistance of Pole and Tower  杆塔接地电阻

main pole and main zero  主导

pole and contour plots diagram  极点等密度图