4. turn on the machine, and then set the tube machine wear trap acid fumes onto the upper part of the tube and turn on Power of a steam trap acid by sub in a fume hood.
4. Turn on the tube and its subsidiaries in the air. Wear acid vapor trap on the upper part of the digestive tube and the Power of a steam trap by acid digestion in a fume hood.
4. Open and set up subsidiaries in sub machine tube machine. Wear detectors on the upper part of the tube steam acid digest and open Power of detectors "on by the ย่อยใน fume hood.