vuam kaus mom hlau nws pib darkening Vuam kaus mom hlau

Vuam kaus mom hlau
Vuam kaus mom hlau
1. npog qhov muag thaiv: ob npaug cov ntxaij lim dej, tsis txhob muaj cov teeb meem uas tawg ultraviolet txoj sab ci thiab infrared txoj sab ci uas ua los ntawm arc thiab nws puas ntawm vuam lub teeb muaj zog rau lub qhov muag, kom nws tshwm sim los ntawm qhov muag fais ophthalmia. 2. lub ntsej muag kev tiv thaiv: txoj kev tiv thaiv txoj kev raug mob los ntawm ib txaws thiab tej yam lub sij hawm zov me nyuam, kom txhob kub yus daim tawv cov tsos mob tshwm sim. 3. kab kev tiv thaiv: airflow, zoo kom tsis txhob muaj cov welding tso teeb meem roj thiab plua av rau qhov puas tsuaj rau lub cev, tiv thaiv cov cuam occupational mob ntawm pneumoconiosis.

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