coal specimens的用法和樣例：
例句
- Two raw coals from Yueliangtian and Kaili coal mines in Guizhou Province were extracted with dichloromethane separately.
摘要用二氯甲烷對貴州月亮田和凱里兩種煤樣進行了索氏萃取，並採用柱色譜對萃取物進行了族組分分離。 - The determined result differences of the caking index of the same coal sample under different test conditions are discussed.
探討了不同試驗條件下同一煤樣粘結指數測定結果的差異。
