Building Construction
Mansard roof is a roof which slopes in

Two directions without break in the slope on each side
Four directions with break in the slope on each side
Two directions with break in the slope on each side
Four directions without break in the slope on each side

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Building Construction
Auger boring

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

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