The features, process, major properties as well as relatives to applications of the vacuum tungsten copper materials are presented.
本文介绍了真空钨铜材料的特点、制取工艺及主要性能，并讨论了与应用有关的问题。
This article describes essential process and design of multiplayer ceramic packages, selecting of major original materials, and its some questions in the research, and production.
本文叙述了多层陶瓷外壳的基本工艺和设计，主要原材料的选用以及在科研和生产过程中的一些问题。
This paper takes processing technology of lime cream materials as the major study object, and explores relationship between production process and performance of basic lime cream and mixed system.
本文将灰膏类材料的加工工艺作为主要研究对象，探讨了灰膏基体材料和混合体系的性能与各自制作工艺之间的关系。
The synthesis of ethyl vanillin from urotropin is a major method with high yields, simple process, and available raw materials.
乌洛托品法是合成已基香兰素的一种重要方法，它操作简单，原料易得，产率较高。
Propylene and ethylene are the major raw chemical materials for organic chemical industry, which are mainly derived from hydrocarbon steam cracking process.
丙烯、乙烯是重要的基本有机化工原料，且二者的市场需求日益旺盛，其主要来源是蒸汽裂解装置。
The potato is the forth-largest crop in the world, and it is the major source of the food, vegetable, forage and the process and production of raw materials in our country.
马铃薯是世界第四大粮食作物，在我国粮食、蔬菜、饲料和加工原料生产上占有重要地位。
The potato is the forth-largest crop in the world, and it is the major source of the food, vegetable, forage and the process and production of raw materials in our country.
马铃薯是世界第四大粮食作物，在我国粮食、蔬菜、饲料和加工原料生产上占有重要地位。
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