Nyob rau hauv lub ntiaj teb no ntawm pipeline infrastructure, qhov tseem ceeb ntawm integrally insulated pob qij txha yuav tsis tau overstated. Cov khoom tseem ceeb no ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev ncaj ncees thiab kev nyab xeeb ntawm cov kav dej, tshwj xeeb hauv kev lag luam xws li cua sov, roj, roj, tshuaj, ...
Nyeem ntxiv