Therefore, the discovery and study of the coal balls is of great significance in theory and practice.
因此，这种煤核的发现和研究具有一定的理论和实际意义。
The isolated and anatomically_preserved lepidodendralean leaf cushions were described from coal balls in Wangjiazhai Formation (upper Upper Permian) in western Guizhou Province.
描述了贵州水城矿区汪家寨组（晚二叠世晚期）煤核中一种脱落的具解剖构造的鳞木类叶座。
The effects of binder and damp mill on green balls, the process for preheated pellets with high strength and easy reduction, and coal-based direct reduction iron(DRI) were studied.
以新疆磁铁精矿为原料，采用“一步法”直接还原，研究粘结剂种类和润磨方式对生球质量的影响，高强度、高还原性预热球团的制备及煤基直接还原的工艺。
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