...化钨制碰撞环（Impact Ring）]或[碳化钨制均质阀座（Passage Head）,陶瓷制冲击头（Impact Head）,不锈钢制碰撞环（Impact Ring）]两种组合。 生产型：材质用全陶瓷制品比较多，也有用全碳化钨制和碳化钨包埋陶瓷的，需要根据实际 情况选用。
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Impact Ring Model 冲击环模型
·2,447,543篇论文数据，部分数据来源于NoteExpress
Mr Crow said First's pay offer was "self-funding" - meaning it would have no cost impact on the company and ring-fences their profits.
BBC: Strike vote by First bus workers in Devon and Cornwall
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