a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite.
一种白色三价金
元素，有时归
，
堪的纳维亚钪钇石中。
a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite.
一种白色三价金元素，有时归，堪的纳维亚钪钇石中。
At present, trivalent chromium electroplating process has became one of the mostimportant techniques to taking place of the seriously pollutional hexvalent chromiumelectroplating process.
目前，三价铬电镀工艺已经成取代重污染六价铬电镀的最重要技术之一。
Objective Analyzing the quality condition and problems of trivalent Oral Polio Vaccine dragee(TOPV)(after implemented National Lot Release,and evaluating the quality of TOPV.
目的分析实施国家批签发前后三价口服脊髓灰质炎减毒活疫苗糖丸(TOPV)的质量及存在问题,评价TOPV的质量。
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