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large
only from the eighteenth century.
Engineering Skills and Construction
Monuments provide an insight into the technologies
used for construction. Take something like a roof for
example. We can make this by placing wooden beams
or a slab of stone across four walls. But the task
becomes difficult if we want to make a large room with
an elaborate superstructure. This requires more
sophisticated skills.
Between the seventh and tenth centuries architects
started adding more rooms, doors and windows to
buildings. Roofs, doors and windows were still made
by placing a horizontal beam across two vertical​

Answer 1

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