big elevation angle的用法和样例：
- dip haulage big elevation angles
- Tilting Prevention and Slippage Prevention of Fall- Mechanized Mining Equipment in Big Elevation Angle Workface
- At last, the azimuth angle and the elevation angle are derived from the aim area barycentre.
- The effects of blade elevation angle of rotating-stream-tray scrubber affecting process on the wet calcium FGD process was studied experimentally.
- The effects of blade elevation angle of rotating_stream_tray scrubber affecting process on the wet calcium FGD process was studied experimentally.