1. Tsim los nrog muaj zog nano kua nplaum, cov nplaum ruaj khov thiab tsis muaj ib qho kab ib zaug tshem tawm lub bracket
2. ruaj khov magnetic teb, ruaj ntseg navigation, tsis cuam tshuam rau lub xov tooj ntawm tes teeb liab
3. Haum rau 4.7-7.2 nti xov tooj ntawm tes, kuj ua haujlwm nrog lub xov tooj
4. Tsis txhob siv cov tshuaj hnyav hnyav rau kev tu, nws raug nquahu kom so nrog me ntsis damp daim ntawv phuam lossis ntaub mos.