Tshem tawm cov raj xa dej uas twb muaj lawm thiab rov tso ib lub raj xa dej, faus tob, tob hauv qab txheej txheej av khov. Lub installation ntawm hluav taws xob tshav kub tracing rwb thaiv tsev yog los qhwv lub cua sov cable rau ntawm qhov chaw ntawm cov yeeb nkab thiab qhwv lub sab nraud roj hmab-yas daim txhuam cev rau rwb thaiv tsev. Tso cov kav dej rau kev txuag hluav taws xob txhais tau tias tso cov kav dej ntawm ib sab ntawm cov kav dej, thiab siv qhov kub ntawm cov kav dej kom tiv thaiv cov kav dej qub los ntawm kev khov. Siv cov khoom siv rwb thaiv tsev rau kev rwb thaiv tsev.
