单词：humus coal
humus coal的用法和样例：
例句
- Peat, the first stage in the formation of coal, is a low-rank material.泥炭是煤形成的第一阶段，是一种低质煤。
单词：humus coal 相关文章
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英语新闻
中国富煤缺油少气的能源资源特点，造成能源消费主要依赖于煤炭，石油则主要依靠进口，而且带来一系列环境问题。煤清洁转化技术则可以帮助缓解这一难题。近日专家表示，我国将在2020年
实用英语