lead metallurgy

metallurgy ... jet metallurgy 喷射冶金 lead metallurgy 铅冶金学 light-alloy metallurgy 轻合金冶金学 ...

铅粒,lead button,lead... ... ) lead bronze 铅青铅冶> ) lead metallurgy 铅冶金冶> ) area of lpb smelter 冶铅区 ...