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