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对差频测量法的本质进行了深入探讨，进而将原有的差频式动态传动误差测量方法移植成为一种圆分度静态精密测量新方法，并总结出一套时空对偶的新概念──“齿波对偶法”。
The essence of the difference frequency measurement method is discussed in depth, and then the original differential frequency dynamic transmission error measurement method is transplanted into a new method of circularly-dividing static precision measurement, and a new concept of space-time duality is concluded “Tooth wave dual law.”