The basic property of polyamide engineering plastics and application in tractor are introduced. The design and material selection of polyamide engineering plastics parts are discussed.
介绍了聚酰胺工程塑料的基本性能，在拖拉机上的应用现状及聚酰胺塑料零件的选材和设计。
The selection of the fire protector is the problem faced in engineering design and production safety in the plants dealing with petrochemical material, petroleum, natural gas and combustible gas.
阻火器的选用是石油化工厂、石油和天然气工厂、有可燃性气体的工厂生产安全保护和工程设计中常遇到并需解决的问题。
The material selection and design of the plastic bearings as well as the researching and developing of several common engineering plastic bearings were introduced.
阐述了塑料轴承的选材、设计，以及几种常用工程塑料轴承的研究与开发状况。
The material selection and design of the plastic bearings as well as the researching and developing of several common engineering plastic bearings were introduced.
阐述了塑料轴承的选材、设计，以及几种常用工程塑料轴承的研究与开发状况。
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