The majority of the structural components produced by fixed die pressing are iron-based. The powders are elemental, pre-alloyed, or partially alloyed.
大多数用固定模压制的结构件都是铁基的。粉末可以是单一元素、预先合金或部分合金。
Elemental composition can vary within the same copper-ore lode, usually because of varying admixtures of other elements, especially iron, lead, zinc, and arsenic.
即使在同一铜矿矿脉中，元素构成也会发生差异，这一般是因为其它元素，尤其是铁、铅、锡、和砷等程度不同的混合。
Iron has long been known to be an effective catalyst for the oxidation of H2S to elemental sulfur.
一直以来铁被认为是氧化h2s成为单质硫的有效催化剂。
Iron has long been known to be an effective catalyst for the oxidation of H2S to elemental sulfur.
一直以来铁被认为是氧化h2s成为单质硫的有效催化剂。
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