Xov Xwm Tuam Txhab
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Kev nyab xeeb deb ntawm acetylene lub tog raj kheej thiab lub tog raj kheej oxygen
Thaum lub sij hawm tsim kho, lub raj mis oxygen thiab acetylene yuav tsum khaws cia 10 meters deb ntawm qhov hluav taws kub, thiab qhov kev ncua deb ntawm cov pa oxygen thiab acetylene fwj yuav tsum khaws cia ntau tshaj 5 meters.Qhov ntev ntawm thawj xaim (overlay hlau) ntawm lub tshuab vuam yuav tsum b ...Nyeem ntxiv
