coal processing and conversion

• 煤炭加工转化

coal processing and conversion的用法和样例：

例句

1. The importance of coal structure at both molecular and petrographic evels is in a closeed relation to coal preparation, processing, combus tion and environmental aspects.
   它直接关系到煤炭加工转化技术的发展和煤利用对环境造成污染的改善。