infinitely variable短语¹⁴⁴⁹⁷²⁺² 基本例句 无穷变量,平滑调整 This paper introduces a spindle infinitely variable speed system composed of a converter and a con verting motor, and the design of main drive for NC50D numerical control lathe. 介绍了由变频器和变频马达组成的自动无级调速系统和 NC50D数控车床主传动的设计过程。 chemyq