Yini eyenza Ithuluzi Lokusika Umhubhe Ophakeme? Isiqondiso Esiphelele

Yini eyenza Ithuluzi Lokusika Umhubhe Ophakeme? Ithafu lokuqukethwe 1. Isingeniso kumathulu wokusika umhubhe. Ukuhlanganiswa Kwezinto ezibonakalayo 2.2 Idizayini ne-Geometry 2.3 Isikhathi Sokungapheli Nobude 3. Izinhlamvu Zobuchwepheshe ku-Tunnel Cutting Tools 3. 1 Ukusika Okuthuthukile Kwezobuchwepheshe 3.2 Okuzenzakalelayo kanye Nezici Ezihlakaniphile 4. Ukubaluleka Kwe-Cutin