But stainless steel tube outer wall and the outer wall of the copper pipe which pipe bead setting more is still unclear, but can say two pipe wall mostly film condensation.
但不锈钢管外壁和铜管外壁哪种管材的珠状凝结更多尚不清楚，但可以说两种管材外壁大部份是膜状凝结。
Since 2011 carbon and alloy steel seamless pipes for synthesis of carbon steel pipe and outer pipe project of Inner Mongolia Donghua Energy Co., Ltd.
2011年起供内蒙古东华能源有限责任公司合成碳钢管道和外管项目用合金管和碳钢管。
When inner side reinforcing steel bar of tip and bottom pipe were pulled, outer side were pressed.
管顶和管底的内侧钢筋受拉，外侧钢筋受压；
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