Daim ntawv thov:
Ib feem ntawm atxiv ntseejscrewed ua ke nrog ib tug ntsia liaj qhov rooj los yog ntsia hlau rau fastening, ib tug tsim nyog rau tag nrho cov tsim machinery.Lub lifting nplhaib txiv ntoo yog ib qho khoom siv feem ntau siv rau engineering.Cov txiv ntseej nrog cov ntsia hlau, raws li nws qhov sib txawv specifications, drilling, tsau los ntawm cov ntsia hlau.
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