如今各国都在极力使自己的稀土矿供应商多元化，韩国在玻利维亚的勘探活动正是这种例子。
States are now fighting hard to try to diversify their suppliers - as with the South Koreans courting the Bolivians.
研究了采用稀土多元共渗方法提高AZ91 镁合金表面耐腐蚀性能的作用。
This paper investigates improving corrosion resistance of AZ91 magnesium alloy surface by permeating rare earths.
本文主要介绍采用正负压脉冲稀土多元共渗技术对高速钢刀具表面强化的一种新方法。
A new surface strengthening method, RE-Multi-Element diffusion, for HSS cutters by positive-negative pressure pulse process is investigated.
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