... 稀疏（区） rarefaction 稀土盐 rare earth salt 稀土元素地球化学 rare earth element geochemistry ...
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稀土盐是焦化废水活性污泥一特殊激活剂。
The rare-earth salt is a special activator of activated sludge.
首次发现了特定结构的稀土盐对PV C良好的初期稳定性能。
It was discovered for the first time that a kind of rare earth salt with specific structure had good initial stability to PVC.
用乙酸和正丁醇为原料，以不溶性杂多酸稀土盐为催化剂合成了乙酸丁酯。
Catalyzed by insoluble rare earth salts of heteropoly acid, butyl acetate have been synthesized from butanol and acetic acid.
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