preliminary work短语⁹⁶⁶⁷⁷⁺⁶ 基本例句 准备工程 The MOBILE circuit cell build up by planar resonant tunneling diodes and relative circuit were studied, and preliminary work was done for the next mix integration with planar RTD. 率先研究了由平面型共振隧穿二极管组成的 MOBILE电路单元和其它电路单元，为下一步进行平面型共振隧穿二极管的混合集成进行了有益的探索并打下了良好基础； cnki