Cov khoom no muaj cov rwb thaiv tsev siab heev, kub tsis kam, corrosion kuj thiab mechanical zog.
Nws feem ntau yog siv los ua cov khoom siv hauv cov khoom siv sib xyaw, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, Circuit Court board thiab lwm yam kev lag luam hauv teb chaws.
Nws yog kev lag luam khoom siv tshiab uas Lub Xeev txhawb kom tsim kho.
Nws yog dav siv hauv roj av, tshuaj lom neeg kev lag luam, kev tsim kho, kev tiv thaiv ib puag ncig, aviation, tiv thaiv teb chaws thiab lwm yam kev lag luam.
