中级烟煤 meaning in Chinese
medium rank bitumite
Examples
- Medium - rank bituminites are formed by pneumato - hydrothermal metamorphism on the basis of burial metamorphism , and it is partial
深大断裂带及其附近局部发育的中级烟煤是在深成变质基础上，叠加了高温气液热变质作用而形成。
medium rank bitumite