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。
In the case of center-positioned gate, moving die is not separated from fixed die due to the interference of the biscuit part and the cutting of gate is ery difficult after pulling out the product.
对于中心位置浇口，由于产品顶出后模具配件和浇品处披锋阻碍很难去掉而造成动模与定模不能分开。
In fact, while the vast majority of neutral mutations die out, a few spread throughout a population and thus become \ \ \ \ \ \ \ "fixed \ \ \ \ \ \ \".
事实上，大部分中立变异都会被自然选择除灭，只有小部分在群体中传播并因此固定下来。
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