... internal pipe coating 管线内涂层 internal pitting 内点蚀 internal pore surface 孔隙内表面 ...
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The reason why corrosion was seen on the Alaska Pipeline; internal inspection should be strengthened to avoid corrosion pitting.
阐述了阿拉斯加管道腐蚀产生的原因，提出了为避免管道因腐蚀而穿孔，应加强管道内检测的措施；
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