... 紧密填充（Close Packing） 启用后，将以六角形填充排列尽可能紧密地定位 nParticle。否则就以一致栅格晶格排列填充 nParticle。 双壁（Double Walled） ...
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两种方法相结合，特别有效于生产大中型双壁管材。
A combination of these two methods is particularly effective for producing medium-large double-wall pipes.
论述了国内外塑料双壁波纹管成型工艺和成型设备的技术要点。
It reviewed the key points of processing technique and equipment for plastic double-walled corrugate pipe at home and abroad.
针对水平井成井特点，结合大量室内试验，研制了双壁预充陶粒携砾过滤器。
Aimed at the characteristic of horizontal well, combined with large amount of laboratory tests, double-wall pre-packed gravel screen is developed.
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