Daim ntawv thov teb ntawm pex yeeb nkab

Cov kav dej hauv tsev, cov kav dej kub, thiab cov kav dej ntshiab.
Cov kav dej thauj khoom ua kua hauv kev lag luam zaub mov.
Cov kav dej cua sov, nruab nrab cua txias piping system, av radiant cua sov system, hnub ci dej rhaub system, thiab lwm yam.
telecommunications, hluav taws xob kav.
electroplating, roj av, thiab chemical cog pipeline system.