- 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;Start off by ensuring that all of the necessary sections have interfacing connected. When your collar is often a convertible collar by using a stand, sew the collar portion first. Then sew the stand, enclosing the