The effect of yttrium oxide on microstructure, chemical composition and mechanical properties of weld metal was studied and the active mechanism of yttrium oxide was also discussed.
研究了稀土添加剂氧化钇对焊缝微观组织、化学成分以及焊缝金属力学性能的影响，并分析了氧化钇的作用机制。
A catalyst composition including the dinuclear transition metal compound is highly active for a monomer having a polar functional group.
包含所述双核过渡金属化合物的催化剂组合物对于含有极性官能团的单体活性高。
A catalyst composition including the dinuclear transition metal compound is highly active for a monomer having a polar functional group.
包含所述双核过渡金属化合物的催化剂组合物对于含有极性官能团的单体活性高。
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