center-punched 标记打在中央吗(设备标记)? The North and East orientations shall be center-punched on the outside of each vertical vessel approximately 150 mm above the bottom tangent line and 150 mm below the top tangent line. The punch marks shall be circled with white paint. 北向与东向??如何打标记?查看更多3个回答 . 3人已关注