Muaj ntau hom chav huv huv, xws li chav huv huv rau kev tsim cov khoom siv hluav taws xob, tshuaj, khoom siv kho mob, khoom noj, khoom siv kho mob, precision machinery, tshuaj zoo, aviation, aerospace, thiab nuclear kev lag luam khoom. Cov hom sib txawv no ...
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