Xov xwm kev lag luam
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NIJ Standard 0106.01
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Dab tsi yog qhov thev naus laus zis saum npoo ntawm cov phom phom phom?
Dab tsi yog qhov thev naus laus zis saum npoo ntawm cov phom phom phom?Muaj ntau hom kev siv thev naus laus zis ntawm cov mos txwv daim hlau, feem ntau muab faib ua ob pawg: polyurea txheej thiab daim ntaub npog.Cov ntaub npog yog ib txheej ntawm cov ntaub tsis muaj dej qhwv ib ncig ntawm qhov chaw la...Nyeem ntxiv