- Có t?i thi?u 02 n?m kinh nghi?m trong l?nh v?c quan tr?c môi tr??ng lao ??ng ho?c 05 n?m kinh nghi?m trong l?nh v?c y h?c d? phòng;Commence by making certain all the necessary sections have interfacing hooked up. In the event your collar is usually a convertible collar that has a stand, sew the collar segment initially. Then sew the stand, enc