Cov Motors Txhuam Hniav Yas Nrog

Lub Mine Traction txhuam tus txhuam hniav yog tsuas yog siv nyob rau hauv cov roj hmab motors los muab cov pa tawv nqaij ruaj khov rau cov traction conduction.

Txhuam tus tuav ntawm kev railway lub cev muaj zog yog siv rau kev tsheb ciav hlau, uas yog lub hom tseem ceeb ntawm kev thauj mus los hauv cov sijhawm niaj hnub no. Peb cov txhuam hniav tuav...