国产成人精品无码一区二区三区,少妇人妻邻居做爰无码,日本午夜免费啪视频在线

暖暖免费日本高清在线,激情综合色五月丁香六月,百合AV肉片无码资源无码,免费看含羞草AV片成人网站

Home | Collection | Contact us

The company has eleven sets of spiral welded steel pipe production unit with international modern levels and a set of production line of modern 3-layer PE Anti-corrosion coatings. The outer diameter(OD) of spiral welded pipe from Φ219mm to Φ3600mm, the wall thickness of spiral welded pipe from 6mm to 25mm, steel grade from A25-X80.

Detailed content

Jilin gas pipeline ( Changchun )

Changchun northeast loop line and Changchun FAW natural gas pipe line project used our 3PE anti-corrosion steel pipe. The total weight of them is 15000 tons, the specifications are Φ273~Φ529 and the materials are L360 and L245, and we won the praise from my clients.

Video

暖暖 免费 日本 高清 在线,激情综合色五月丁香六月,百合AV肉片无码资源无码,免费看含羞草AV片成人网站

暖暖免费日本高清在线,激情综合色五月丁香六月,百合AV肉片无码资源无码,免费看含羞草AV片成人网站