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 text describes the R&D process for 2CZ234 high current, small package rectifier module.
阐述了2CZ234型大电流小封装整流组件的研制过程。
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。
In section four, we mainly discuss r-strongly local module which is a class of modules being directly connected with r-small submodules.
在第四部分中，我们主要探讨了相对强局部模，这是与相对极大子模有直接联系的一类模。
In 1986 the U. S. S. R. launched the core module of Mir, a scientific station that was expanded with five additional modules over the next decade.
1986年苏联发射和平号太空站的核心舱是科学用太空站，之后十年又扩充加入额外的五个舱。
Finally, the prototype of a new type snakelike robot based on the P-R module was produced, which further verified the agility of P-R module.
最后通过研制的新型攀爬蛇形机器人样机，验证了P - R模块的可实现和灵活性。
The purpose of the paper is to build a module of small molecular receptor fragments charactering normal VLDL-R binding function and study the mechanism of VLDL-R binding to ligand.
建立具有正常极低密度脂蛋白（VLDL）受体结合功能的小分子受体片段模型并借助此模型研究VLDL受体与配体结合的作用机制。
R is semihereditary ring if and only if the sum of two coflat submodules of every R module is coflat module;
是右半遗传环当且仅当任一右R模的两个上平坦子模的和上平坦；
Fan(C&R) Module, Stepper motor, Control panel (device), Sensor, Blower Unit, etc.
冷凝风扇，步进电机，控制面板（器），传感器，鼓风机等。
O2 module is the Siemens R & D and to 90 early in their high-end breathing machine for use on the control precision is high. Security. And stability characteristics of a low failure rate.
O2模块是西门子公司90年代初期研发的并在其高档次呼吸机上使用，其控制精度高、安全、稳定故障率低的特点。
Supported by institute 38 of CECT, a S-band miniaturize T/R module based on MCM technology is studied in this paper.
本课题结合中电科技集团38所的科研项目，研制了一种基于MCM技术的小型化S波段T/R组件，达到了良好的效果。
The design progress and R&D plans of Chinese ITER test blanket module design based on the solid breeder concept are also presented.
最后，介绍了国内开展的基于固体增殖剂概念的ITER实验包层的初步设计概况，对TBM的研发计划提出了建议。
The design progress and R&D plans of Chinese ITER test blanket module design based on the solid breeder concept are also presented.
最后，介绍了国内开展的基于固体增殖剂概念的ITER实验包层的初步设计概况，对TBM的研发计划提出了建议。
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