Shenhai Explosion-Proof
Raws li lub national Mine khoom kev ruaj ntseg Mark Center, Cov khoom uas muaj kis tau tus kab mob no yuav tsum tau undergo rov ntxiv raws li qhov expiry ntawm lawv validity lub sij hawm.
Yog tsis rov ntxiv ib yam khoom ntawv pov thawj tau nyob rau hauv nws cov invalidation. Raws li ib qhov yuav tshwm sim, Tsuas khoom uas expired thee kev ruaj ntseg marks yuav tsis tso cai rau siv.
Nws tseem tsim nyog ntsoov teev tias tus thee kev ruaj ntseg daim ntawv pov thawj Feem ntau txhais li defining txoj cai manufacturing txoj cai thiab duration tso cai rau lub manufacturer, Qhov stipulating txoj cai ntawm tus neeg siv tom qab muas khoom. (Kom paub meej txog cov kev cai, Nws yog advisable los tham nrog lub zos Mechanical thiab Electrical Science Department.)