Building Construction
The term string is used for

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

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

All listed here
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
A tube of about 2 meters length and 20 cm diameter with a cutting edge
A flap valve at the bottom of tube is provided to extract the soil sample

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Building Construction
Depth or height of the arch is the

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

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