- 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;Seal your thread that has a knot or about the device. As you’ve manufactured it all the way round the patch, end the stitch by using a hand knot or by back again-tracking about the device.Bear in mind that they a