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。
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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