Ng??i lao ??ng ???c t? ch?i, r?i b? n?i làm vi?c mà v?n ???c tr? ?? l??ng khi th?y rõ nguy c? x?y ra nguy hi?m, tai n?n.Tùy thu?c vào ??c thù công vi?c, b?n có th? l?a ch?n nh?ng lo?i v?i phù h?p ?? ??m b?o v?a ??p m?t, v?a ??m b?o tính n?ng b?o h?. D??i ?ây là các ch?t v?i thông d?ng trong could ??ng ph?c k? thu?t hi?n nay:– Ch?ng

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