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火法精炼锡采用( )方法除掉杂质。
A.溶折
B.熔折
C.解析
D.凝析
E.气析
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天然气输送系统中的液体和固体杂质主要来自三方面Liquid and solid impurities in natural gas transportation system mainly come from three aspects:()A.采气时井下带来的凝析油、凝析水、岩屑粉尘Condensate oil, condensate water and cuttings dust brought by underground gas extraction#B.管道施工时留下的脏物和焊渣Dirt and welding slag left by pipeline construction#C.管内的锈屑和腐蚀产物Rust and corrosion products in the tube#D.其他
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