Peb tsom mus rau mining tshuaj ntsuam cov cuab yeej tsim thiab tsim khoom, kev tshaj lij hauv kev vuam thiab kev ua haujlwm ntawm cov khoom siv mining khoom seem. Peb tau sau ntau cov kev paub dhau los hauv cov khoom siv mining fabricating txheej txheem hauv kev ua haujlwm ntawm cov thee ntxhua khaub ncaws thiab cov khoom siv npaj.
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