Building Construction
Auger boring

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

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Building Construction
Depth or height of the arch is the

Perpendicular distance between springing line and extrados
Vertical distance between springing line and intrados
Perpendicular distance between intrados and extrados
None of these

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