longwall retreating
相关英语词汇推荐
- internal impedance
- tunneling equipment
- tilting cup feeder
- full load running
- Residual expansion rate
- Intermediate product
- burning time
- cement injection
- workings
- crusher head
- elastoplastic rock
- through
- fast extraction
- lump formation
- hand held drifter
- drop crushing
- worm gear drive
- bolt installing equipments
- single stage separation
- alidade