Thola isephulelo esingu-95% Uma uthenga manje
Izidingo Zokuhlola. Ukuhlolwa kokufaneleka kwenziwa kumakhodi wokushisela noma imboni namazinga enkampani. Izimfuneko, imikhawulo, kanye nemibandela yokwamukelwa yokuhlolwa ichazwe kulokhu kushicilelwa. I-WTTI isebenza ngezinhlobonhlobo ezihlanganisa: i-AWS, i-ASME, i-API, i-NACE, i-ASTM, i-NAVSEA, ne-MIL-STD. Ihlola ukuhanjiswa
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