Answer:
Steel.
Explanation:
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Based on the high breaking down, corrosion and shearing resistance steel has, it is by far the best option to be chosen in order to support the beams in a building.
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3Fe2O3 + H2 --> 2Fe3O4 + H2O
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You can make Cake CAke Cake Cake and other stuff too Ig
A, it is metal oxide