Lub qhov muag hluav taws xob tsawg yog ntsia rau ntawm lub taub hau ntawm lub taub hau txheej txheem ntawm lub teeb ci ntsa iab ntawm qhov nruab nrab ntawm qhov pom ntawm cov neeg laus hauv Suav.Tom qab hnav daim npog ntsej muag, ntxiv rau, lub teeb lub teeb tau raug txo kom zoo rau lub teeb pom kev zoo ntawm tus qauv ntawm lub taub hau.Daim duab qhia chaw ua yeeb yam Aft ...
Raws li cov qauv: BS En149: 2001 + A1: 2009 Kev Ntsuas Ua Haujlwm Ib Nrab ntawm Ib Nrab ntawm Ib Nrab ntawm Ib Nrab ntawm Ib Nrab ntawm Lub Tebchaws to test the amount of dust collected on the filter when the airflow through the filter by way of inhalation in a certain dust...