A. Zinc blende B. White vitriol C. Blue vitriol D. Calamine
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A. Au B. Mn C. Hg D. Ca
A. Iron pyrite B. Copper glance C. Cinnabar D. Cadmium sulphide
A. Stainless steel B. Nickel-chromium steel C. Cast iron D. Wrought iron
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A. Magnetic treatment B. Froth floatation C. Electrolysis D. Roasting
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A. Brass B. Invar C. Solder D. German silver
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A. Iron carbide B. Silicon carbide C. Silicon dioxide D. Graphite
A. Two B. Three C. Four D. Many
A. Stainless steel B. Pig iron C. Solder D. German silver
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A. Tempering B. Nitriding C. Annealing D. None