Building Construction
The term string is used for

The underside of a stair
Outer projecting edge of a tread
A sloping member which supports the steps in a stair
A vertical member between two treads

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Building Construction
Auger boring

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

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