-
Ohun elo Awọn ọja JCDRILL
QUARRIES AND MINES Awọn ohun elo iwakusa diẹ sii: 1. Iwakusa oju-ilẹ 2. Iwakusa apata ti o wa ni abẹlẹ 3. Iwakusa apata lile labẹ ilẹ 4. Ṣiṣejade liluho ti blastholes ni awọn quaries ati awọn maini.Nibẹ ni o wa mẹrin akọkọ orisi ti blasth...Ka siwaju
