density grades

  • 密度级

density grades的用法和样例:

例句

  1. The UV photooxidation characteristics of different density macerals of Shenfu coal have been studied in a fixed bed photoreactor.
    摘要在固定床光氧化反应器中,对神府煤不同密度级组分进行了紫外光光氧化研究。
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