乙烯

Because of excessie wear and tissue reaction, polytetrafluoroethylene was replaced by high-density polyethylene and later by ultrahigh molecular weight polyethylene.

由于聚四氟乙烯的磨损和组织反应严重，因而被高密度聚乙烯以及后来的超高分子聚乙烯所取代。

The present invention relates to a polytetrafluoroethylene tube, and more particularly to a PTFE tube for a flexible hose.

本发明涉及聚四氟乙烯管，尤其涉及用于柔性软管的PTFE管。

Objective To seek a method for reducing postoperative infection of augmentation rhinoplasties with Expanded polytetrafluoroethylene.

目的：寻找一种降低膨体聚四氟乙烯隆鼻术后感染发生率的方法。

A Leaf-like dipole printed on the finite Polytetrafluoroethylene plane with an operating frequency band of 6-8GHz is presented in this paper.

文章摘要：设计印刷在有限大聚四氟乙烯板上的叶状偶极天线，设计的工作频带是6-8 GHz。

The synthesized nonabsorbable materials is one kind of implant materials that achieve wide application, such as polypropylene, polytetrafluoroethylene and other patches.

合成的不可吸收材料是目前使用最多的植入材料，如聚丙烯、聚四氟乙烯及其复合补片。

It is probably useful to modify engineering plastics with the addition of polytetrafluoroethylene, which is a crystal polymer with lower friction coefficient, to improve composites friction and wear performance.

添加自身摩擦系数较低的结晶性高分子材料聚四氟乙烯是一种比较有效的改善工程塑料摩擦磨损性能的方法。

Examined is the initiation mechanism of flashover along the surface of polytetrafluoroethylene under AC voltage in vacuum.

以聚四氟乙烯为例研究了交流电压下聚合物绝缘材料在真空中沿面闪络发生前的表面发光特性。

Expanded Polytetrafluoroethylene has particular network structure and stable chemical property which make it useful for hazarded heard repairing.

膨体聚四氟乙烯具有独特的结构和性能，生物相容性良好，非常适合作脏器修补材料和整形外科材料。

Based on the coordinate bonding theory, a hydrophobic expansible polytetrafluoroethylene membrane was modified to make it hydrophilic.

采用配位键合理论对疏水性膨体聚四氟乙烯膜膜进行亲水改性，并对其用于水过滤过程的性能进行了研究。

Therefore, the mechanical properties of mortar can be improved efficiently by adding polyvinyl acetate.

因此，掺入聚醋酸乙烯能有效改善砂浆的变形力学性能。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。