Dukas cov tshuab cua cais roj sab nraud yooj yim heev rau kev saib xyuas.

✅ Cov roj cais sab nraud:Kev hloov lim dej sai thiab yooj yim, txuag tau lub sijhawm saib xyuas thiab cov nqi zog ua haujlwm.

✅ Ruaj khov thiab ruaj khov:Siv cov thev naus laus zis German, ua tiav qhov kev lim dej raug txog li 3ppm, tiv thaiv lub tshuab tseem ceeb tau zoo.

✅ Kev ua haujlwm zoo thiab txuag hluav taws xob:Lub kaw lus tswj hwm ntse hloov kho qhov ntim pa tawm raws li qhov xav tau, txo qis kev siv hluav taws xob.

✅ Kev ua haujlwm suab nrov qis:Kev tsim tshwj xeeb, suab nrov ua haujlwm tuaj yeem qis dua 62 decibels.