A. An electric furnace B. A blast furnace C. An open hearth furnace D. None of these
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A. Cast iron B. Wrought iron C. Pig iron D. Steel
A. Fe or Al B. Sn or Zn C. Pt or Au D. Cu or Ni
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A. Carbon steel B. Molybdenum steel C. Stainless steel D. Nickel alloy steel
A. Fe B. An alkali metal C. Silver D. Mercury
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A. Oxygen B. Water C. Moisture D. All of these