该冲洗管包括外管和内阀。
The cleaning tube comprises an outer tube and an internal valve.
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.
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