Opal, crystal and twelve types of aggregates from Beijing were studied with this new method.

利用这种新方法对蛋白石、水晶和十二种来自北京的一般骨料的碱活性进行了研究。

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Opal, crystal and twelve types of aggregates from Beijing were studied with this new method.

利用这种新方法对蛋白石、水晶和十二种来自北京的一般骨料的碱活性进行了研究。

youdao