近年来,我国大型火力发电厂的锅炉汽包集中降水管,插入式焊接角焊缝相继发现裂缝等严重缺陷.对于这些缺陷的产生,论点不一.从现有......

Magic number cluster ion Mn5+ and abundant Mn/O cluster ions havc been formed by 532nm laser ablation of MnCO3 solid sam......