Building Construction
Mansard roof is a roof which slopes in

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

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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