• 弯曲生长所有焰熔法合成刚玉一个显著特征

    Curved growth lines are a prominent feature of virtually all Verneuil synthetic corundums.

    youdao

  • 弯曲生长所有焰熔法合成刚玉一个显著特征

    Curved growth lines are a prominent feature of virtually all Verneuil synthetic corundums.

    youdao

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