At present, circle chain sawed adopts handwork and cutoff by flame under augmenting ventilation in coalwork face of our country.
井下工作面圆环链主要是采用手工锯断或在加强通风条件下利用火焰割断。
2
The slope adjustment mining are analyzed. The production experience of reducing frequency of fully mechanized mining coalwork-face removing is provided.
通过对综采工作面调斜回采的总结分析，为综采工作面减少搬家次数及转采提供了借鉴经验。
3
He then proceeded to teach himself geology, and when he was twenty-four, he went to work for the company that was excavating the Somerset Coal Canal in the south of England.