Beijing Huasheng Hlau Khoom Co., Ltd. tau tsim nyob rau hauv 2003. Lub tuam txhab tau ntev tau koom tes nrog kev ua haujlwm ntawm cov hlau tsis muaj hlau (tungsten, molybdenum, tantalum, niobium, npib tsib xee, cobalt, ferro alloys thiab lub cub tawg). Main ntau lawm thiab ua: tungsten thiab molybdenum p ...
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