Science and Technology · Surveying
सुरंग सर्वेक्षण में, 'ब्रेकथ्रू' (breakthrough) शब्द का अर्थ क्या है?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1विपरित दिशाओं से खोदे गए हेडिंग्स (headings) का मिलना✓
- 2ड्रिलिंग के दौरान भूजल की खोज
- 3मुलायम मिट्टी में पहला उत्खनन विस्फोट
- 4सुरंग लाइनिंग का पूरा होना
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