DIN, ISO thiab AFNOR Standards - Lawv yog dab tsi? Feem ntau Hunan Cov khoom lag luam zoo sib xws nrog cov qauv tsim tshwj xeeb, tab sis nws txhais li cas? Txawm hais tias peb yuav tsis paub nws, peb ntsib cov qauv txhua hnub. Ib tus qauv yog ib daim ntawv uas qhia txog qhov yuav tsum tau muaj rau ib tus khub tshwj xeeb ...
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