Tsis ntev los no, tom qab tsis tu ncua ntawm tus nqi ntawm steel coils, tam sim no cov nqi tau pib nce. Qhov no yog lub sijhawm zoo los yuav cov hlau coils.
Tus nqi sib txawv raws li hauv qab no:
Yog tias koj muaj kev npaj yuav khoom, thov tsis txhob yig tiv tauj peb.