A new type of Y-base heavy rare earth modificator was developed.
研制了一种钇基重稀土变质剂。
Rare earth consists of two categories: one is heavy rare earth, the other one is light rare earth.
稀土有两种,一种是重稀土,一种是轻稀土。
Rare earth consists of two categories: one is heavy rare earth, the other one is light rare earth.
稀土有两种,一种是重稀土,一种是轻稀土。
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