rat-raceCOCA²⁸⁰¹³⁶⁺⁵BNC⁹¹⁵¹⁷⁺⁸ 基本例句 n.事业竞争;商业竞争 For the limitations of the bandwidth and precision of manufacture, rat-race upper-sideband balanced mixer is utilized in order to realize up conversion. 出于工作带宽和加工精度等方面的因素的考虑,设计采用的是环形电桥单边带平衡混频器来实现上变频。 cnki