Cov hlau enameled yog ib hom hlau winding tseem ceeb, uas muaj ob ntu: tus neeg xyuas pib thiab txheej insulating. Tom qab annealing thiab softening, cov hlau liab qab yog pleev xim thiab ci rau ntau zaus. Txawm li cas los xij, nws tsis yooj yim los tsim cov khoom uas ua tau raws li cov qauv thiab cov neeg siv khoom xav tau. Nws yog...
Qhov tseeb, txhua yam khoom siv hluav taws xob cua sov muaj nws lub neej ua haujlwm. Muaj ob peb yam khoom siv hluav taws xob cua sov uas siv tau ntau tshaj 10 xyoo. Txawm li cas los xij, yog tias lub raj radiant siv thiab saib xyuas kom raug, lub raj radiant yuav ruaj khov dua li cov ib txwm muaj. Cia Xiao Zhou qhia nws rau koj. , Yuav ua li cas ua kom lub radian...
Tau kawg, nickel yog cov hlau tseem ceeb uas tau khawb hauv Sudbury thiab los ntawm ob lub tuam txhab loj hauv nroog, Vale thiab Glencore. Tsis tas li ntawd, tom qab tus nqi siab dua yog kev ncua sijhawm rau kev nthuav dav ntawm lub peev xwm tsim khoom hauv Indonesia txog rau xyoo tom ntej. "Tom qab cov khoom seem ntau dhau thaum ntxov xyoo no, tej zaum yuav muaj kev nqaim hauv ...