1. After graduating from the Institute Terpigorev worked at the Sulin mines, (where?) 2. In 1922 Terpigorev moved to Moscow and headed the chair at the Moscow Mining Academy, (when ?)
3. The scientist took a particular interest in mine safety, (whatproblem ?)
4. His work Coal Mining and Mine Transport Facilities gives a complete description of the state of mechanization in the Donbas.(what work?)
5. His graduation paper dealt with mining of flat seams in the Don­ bas. (whatkindofproblem?)
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Rita7711    2   04.03.2021 07:23    22