The effects of positive and negative voltage on phase constitution of ceramic coating on aluminum alloy prepared by micro-arc oxidation were studied by XRD analysis.
通过XRD分析，研究了正向、负向电压对铝合金微弧氧化陶瓷层相组成的影响。
By gas drainage, the negative pressure isn't stable in the goal, the coal oxidation accelerates.
由于瓦斯抽放，造成采空区负压不稳定，加速了煤体氧化过程。
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