Building Construction
Crown is located at

Highest point on the extrados of the arch
Skew-back of the arch
Highest point on the intrados of the arch
None of these

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Building Construction
Auger boring

Is most economical up-to a depth of 5 meters
All of these
Is the most primitive method for making a hole in the ground
Is generally employed in cohesive and other self soils above water table

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