Validity period of Explosion-Proof Certificate thiab yuav ua li cas thiaj thov tau nws

Nws validity ntawm lub tawg-pov thawj daim ntawv pov thawj extends rau 5 Xyoos, Thiab nws yuav tau txais los ntawm peb tog soj ntsuam cov koom haum uas tau raug tso cai los ntawm tsoom fwv teb chaws.