Mining Quiz M C Q Test
Открыть в Telegram
Mining daily Test series 2021
БольшеСтрана не указанаКатегория не указана
1 959
Подписчики
Нет данных24 часа
+47 дней
+2530 дней
Архив постов
10. Gassy seam of third degree means a coal seam or part lying within the precincts of mine not being an opencast working where the rate of emission of inflammable gas per ton of coal produced exceeds
