coal grade的用法和樣例：
例句
- The methods of making solid coal sorbent and liquid gelsorbent from lignite are also discussed in this paper.
列舉了由褐煤製取固體煤質吸附劑和液體凝膠吸附劑的方法。 - The paper introduces the requirement forcoal quality and the application of coal blending of the Texa-co pressure coal-water slurry.
簡介了德士古水煤漿加壓氣化技術對煤質的要求以及配煤在其中的應用。
