Cov Koob Tshuaj Siab
Cim cov qauv uas ntev tshaj 150 meters, xws li cov cua tshuab, cov masts xa hluav taws xob, cov chimneys, cov masts tshaj tawm, thiab lwm yam. Peb cov teeb ci ntsa iab yog cov khoom siv sawv ntsug thiab muaj cov yam ntxwv tshwj xeeb xws li kev saib xyuas qhov txhaum, photocell, GPS synchronization thiab lwm yam.
