ducted purl
... purl circular 双反面圆型针织机 purl knit 双反面针织 ducted purl 管道输送口 ...
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用于石油天然气及城市燃气、热、排水输送管道的补口防腐。
Used for protecting the natural gas and petroleum pipe from corrosion.
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The technology is studied on steel pipeline surface by hot spraying with oxygen-natural gas.
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