Briefly presents the production of PVC resin at home and abroad, its present application situation, its prospect prediction as well as its developing trend.
简述了聚氯乙烯树脂国内外的生产情况，市场应用领域的现状和前景预测以及聚氯乙烯树脂的发展趋势。
The present situation and developing prospect of HDPE pipes' resin and HDPE pipes were introduced. Some investigated enterprises of processing pipes were presented. Some Suggestions were put forward.
介绍了我国HDPE管材专用料、管材的现状和发展前景以及管材加工企业的现状。在调查研究的基础上，提出了一些建议。
This dissertation introduces the background and significance of the research and the present situation and developing prospect of the EMA Servo amplifier.
论文介绍了选题背景和意义以及电动舵机伺服放大器的现状和发展前景。
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