| • पिच कोयला | |
| pitch: चोटी डामर चढ़ाव या | |
| coal: अंगार कोयला कोयला | |
pitch coal मीनिंग इन हिंदी
pitch coal उदाहरण वाक्य
उदाहरण वाक्य
- Quadratic function analysis of greatest subsidence angle during mining pitching or steerly pitching coal seam
- Abstract : this article mainly introduces the preparation of petroleum pitch coal additive agent and the slurrying ability of coal on adding petroleum pitch