Chinese Coal Classification 中国煤炭分类
coal classification system 煤炭分类法 ; 煤分类系统
ussr coal classification 苏联煤炭分类
poland coal classification 波兰煤炭分类
coal classification systems 煤分类法
american coal classification 美国煤炭分类
international coal classification 国际煤分类
coal classification by size 煤按粒度分类法
Principal Characteristics Determing Coal Classification 决定煤类别的主要特征
In China national standards of coal classification, there only no type division of natural coke so far.
目前中国煤炭分类国家标准中，唯独对天然焦没有明确的分类指标。
The coal classification distribution of coal bearing strata in the Up Permian Series of Guizhou has an X type feature in plan.
贵州上二叠统含煤岩系煤级分布在平面上呈现X型分布特征，即具有东、西侧变质低，中部变质高的特点，分布规律明显。
Combine top-coal classification with roof classification for the first time, which make up the inadequate of former classification program.
首次将顶煤的分类与直接顶、老顶的分类结果相结合，弥补了原有顶板分类方案不适合放顶煤采场的不足。
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