muffler outer pipe 减声器外管
polythene outer pipe 聚乙烯外管
outer pipe load 接管外载荷
outer balance pipe 外平衡管
guide pipe with outer insulation 外隔热导流管
Outer Steel Pipe 外套钢管
It adopts outer pipe co-extrude technology, improving the joint stress among layers.
采用的外管共挤技术，提高了管材的层间结合强度。
It adopts outer pipe co - extrude technology, improving the joint stress among layers.
采用的外管共挤技术，提高了管材的层间结合强度。
The preparation method comprises preparation of the inner pipe and connection of the inner pipe and the outer pipe.
本发明所述的制备方法包括内管的制备和内、外管连接。
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