rank of coal meaning in Chinese
煤的品级
Examples
- Characteristics in laser raman spectrum of different ranks of coal
不同变质程度煤的激光拉曼光谱特征 - Prevalence of pneumoconiosis in coal miners exposed to different ranks of coal mine dusts in guangxi province , china
某煤炭矿山建设公司尘肺发病规律及致残结果分析