In the design of Shaan Jing gas pipeline, in the light of the concrete condition and the overall technical and economic contrast, three ply PE external anti corrosion layer has been adopted.
陕京天然气输气管线设计中，结合管线的具体情况和所进行的全面技术、经济对比，选用了三层PE外防腐层。
Three ply sandwiched base, heating evenly.
三层复合底，受热均匀。
这样就制成了一种三层金属材料。
The results of two three-ply samples calculated by this method are in good agreement with experimental data.
给出的两个三层样品的计算结果与实验值符合得很好。
A type of yarn, usually three-ply and having one thread looser than the others, that produces a rough-textured cloth.
一种纱线，通常有三股，其中一股较其它股松散，用于制造粗纹布。
A type of yarn, usually three-ply and having one thread looser than the others, that produces a rough-textured cloth.
一种纱线，通常有三股，其中一股较其它股松散，用于制造粗纹布。
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