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。
It adopts outer pipe co-extrude technology, improving the joint stress among layers.
在相同的情况下，外管出现干涸时的截面含汽率大于内管出现干涸时的截面含汽率。
Under the same conditions critical qualities in outer tube are always larger than that in inner tube.
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