Ntev npaum li cas Kev Pabcuam Lub Neej Ntawm Kub-dip Galvanized Rectangular Steel Pipe?

Sab hauv ib puag ncig: mus txog 30 xyoo lossis ntau dua
Ib puag ncig sab nraum zoov: 15-25 xyoo
Ntug hiav txwv / tshuaj lom neeg ib puag ncig: 10-15 xyoo (tseem zoo dua li cov yeeb nkab steel zoo tib yam)
Tsuav cov zinc txheej tsis raug puas tsuaj loj, cov hlau tuaj yeem tiv thaiv los ntawm xeb.