这个品质钴钨环是免费，以避免过敏，而且有硬质合金，使其耐划痕。
This Quality Tungsten Ring is Cobalt Free to avoid allergies and it has the Carbide to make it Scratch Resistant.
这是钴钨环免费，为了避免过敏，而且有硬质合金，使其耐划痕。
This Tungsten Ring is Cobalt Free, to avoid allergies and it has the Carbide to make it Scratch Resistant.
介绍了用热的浓硫酸处理废硬质合金，回收金属钴和碳化钨的方法。
This article reports on a method of retrieving cobalt metal and tungsten carbide from hard alloy scrap by the sulphate method.
它采用几个“档次”含有钨硬质合金和粘结剂不同比例(通常是钴)。
It is offered in several "grades" containing different proportions of tungsten carbide and binder (usually cobalt).
它采用几个“档次”含有钨硬质合金和粘结剂不同比例(通常是钴)。
It is offered in several "grades" containing different proportions of tungsten carbide and binder (usually cobalt).
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