lunar r module 登月舱
left R-module 左R模
power r module 电源块
left r module 左r模
right r-module 右r模
R-module isomorphism R一模同构
finitely generated free R-module 有限生成自由R
This peper introduces the concept of direct-projective covers, and prove that a ring R is left perfect if and only if every left R-module(flat left R-module) has a direct-projective cover;
本文引入直投射覆盖的概念，证明了环R为左完全环当且仅当每一个左R-模（平坦左R-模）具有直投射覆盖；
The cooling problem of solid state active phased array radar is discussed in this paper. And the type of a high efficient cold plate with plate fin that is suitable for T /R module is introduced .
对固态有源相控阵雷达的冷却问题进行了探讨，并且介绍了一种适合于T／R组件用的高效率板翅式冷板。
The principle of digital T/R module based on direct digital synthesis (DDS) technology is proposed, and the experiment results on the digital T/R module are given in this paper.
简要介绍了基于直接数字合成（DDS）技术的数字T/ R组件的基本原理，对基于DDS的相控阵数字发射组件进行了实验研究，文章给出了实验结果，并进行了分析。
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