The paper introduces the sedimentary environment of coal and coal?bearing strata,the properties of coal seams and the causes resulted in the variation of seam thickness in laung mining district,Kalimantan Tengah,Indonesia. ?是什么意思_The paper introduces the sedimentary environment of coal and coal?bearing strata,the properties of coal seams and the causes resulted in the variation of seam thickness in laung mining district,Kalimantan Tengah,Indonesia. ?在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句