Tus qhua los ntawm Hungary caw Yu BinBin-tus kws tshaj lij los ntawm HangZhou BoXiang Gas Equipment CO., LTD los pab nrog peb txoj haujlwm ntawm Mechanical Engineering, Szent Istvan University txij hnub tim 10, DEC.-31st, DEC.2019. Tus qhua yuav ib txheej ntawm cov khoom siv oxygen, ...
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