Lub enameled hlau yog ib hom tseem ceeb ntawm winding hlau, uas muaj ob feem: neeg xyuas pib thiab insulating txheej.Tom qab annealing thiab softening, cov hlau liab qab yog pleev xim rau thiab ci rau ntau zaus.Txawm li cas los xij, nws tsis yooj yim los tsim cov khoom lag luam uas ua tau raws li cov qauv thiab cov neeg siv khoom.Nws yog ...
Nickel, tau kawg, yog cov hlau tseem ceeb hauv Sudbury thiab los ntawm ob lub nroog cov tswv lag luam loj, Vale thiab Glencore.Tsis tas li ntawd tom qab tus nqi siab dua yog ncua sij hawm rau kev npaj nthuav dav ntawm cov peev txheej tsim khoom hauv Indonesia mus txog rau xyoo tom ntej."Tom qab cov nyiaj seem dhau los ua ntej xyoo no, tuaj yeem muaj qhov nqaim hauv ...