英语语法分析

The modification of the asphalt with anthracitic coal and coke were studied in this paper.

采用无烟煤和焦炭对国产普通沥青进行了改性研究。

It is the focus problem for anthracitic coal production enterprise to increase percentage of lump coal and reduce amount of lump coal with size smaller than lower size limit.

提高块煤率、降低块煤限下率是当前无烟煤生产企业关注的焦点问题。