The installation of the ____ at the top of the Roman arch transferred the weight of the arch and the load it carried into the remaining stones that were locked together with friction.
A. keystone
B. aqueduct
C. gravel layer
D. gutter
Answer: A
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A) Planetary gears B) Sun gear C) Ring (annulus or internal) gear D) All of the above
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A) Temperature B) Frictional material C) Surface finish D) Speed difference between the two surfaces
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A) To keep them out of bad weather B) To hide them from other welders C) To prevent moisture absorption D) To keep them warm E) None of the above
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A) Silicon links B) spst switches C) Metal links D) Shorted junctions
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