primary-secondaryCOCA²⁵¹⁵²²BNC²³⁶²¹³⁺¹ 基本例句 🌏小学升初中；初级-次级；二次侧 This paper introduces a theory based on off-line interpolation suitable for NC machining to generate curved line or face, with a primary-secondary computer NC system. 本文提出了一种适用于一般空间曲线、曲面数控加工的离线插补原理，并探讨了书这一原理应用于主从式数控系统的理论和实战问题。 cnki