来吧!试试你自己!? for uea reaactor(should be urea reactor) ,bottom hemi head to skirt joint will be a butt welded , by providing weld built up on the bottom head. have a try! 对于尿素合成塔,通过在底部封头处焊缝积聚以使底部封头和裙座对焊连接。 does the second comma need to be kept? also, please pay more attention to your spelling.查看更多