1. Rau cov kav dej uas muaj qhov siab tshaj plaws shaving yuav tsum tau, vim tsis sib npaug ntawm cov roj siv los ntawm cov neeg siv, cov yeeb nkab ntau zaus hloov pauv, thiab kev sib hloov kev ntxhov siab raug kev txom nyem los ntawm cov yeeb nkab steel, cov teeb meem uas muaj nyob rau hauv cov kav dej yuav nthuav dav nyob rau hauv alternating stresses. Kauv welded steel kav nrog ntau welds thiab ...
Nyeem ntxiv