stone coal

• 石煤,硬煤

stone coal的用法和样例：

例句

1. The principles and low pollution process in production of vanadium pentoxide with stone coal containing vanadium are introduced in detail.
   介绍用含钒石煤生产五氧化二钒的原理和低污染生产工艺。
2. From the coal rank and the combustion characteristics and kinetic analyzing results, the stone coal should be classed as a high rank and maggy anthracite coal.
   根据煤阶和燃烧特性及动力学分析判断，石煤属于高变质的劣质无烟煤。
3. Soft coal burns with more flames than hard coal.
   烟煤燃烧时火焰较无烟煤多。
4. We also supply blind coal and soft coal from China and Indonesia.
   煤炭产品主要是无烟煤与有烟煤等。