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公开了一种聚乙烯组合物。
Disclosed is a polyethylene composition.
youdao
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介绍了一种聚乙烯管道热熔焊机控制系统。
A control system of a butt fusion welding machine for PE pipe is introduced in this paper.
youdao
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本发明涉及一种聚乙烯涂装弯管及其制造方法和设备。
The invention relates to a polyethylene coating elbow, producing method and the equipment.
youdao