我们所有的钨钴环是免费和低过敏性。
All of our Tungsten rings are Cobalt Free and hypoallergenic.
本文以钨酸钠和硝酸钴为原料合成了钨钴杂多酸盐。
Tungstocobalt heteropoly salts were synthesized using sodium tungstate and cobalt nitrate as materials.
结果表明，钨钴合金从孔隙底部致密地向上填充，能完全封闭孔隙。
The experimental results showed that W-Co alloy was compactly filled up from the bottom of holes, and the holes were sealed completely.
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