In dive-gathering mining method, the miner sinks after loading counterweights at the surface.
举一反三
- The front loading machine can be used as the main mining and loading equipment in large open pit mines.
- he main production links of open-pit mining production technology include rock preparation, mining and loading, transportation and .
- 中国大学MOOC: If the electric flux through a closed surface is 0, then there is no net charge inside the surface.
- If the electric flux through a closed surface is 0, then there is no net charge inside the surface. A: 正确 B: 错误
- On the ideal conductor surface, the relationship between the electric field lines and the conductor surface is A: the electric field lines is always pertendicular to the conductor surface. B: the electric field lines is always parallel to the conductor surface. C: there is no electri field lines exsited. D: unable to determine the relationship.