Building Construction
Depth or height of the arch is the

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

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Building Construction
Rotary drilling

Hinders the ground water observations and permeability test
Is not suitable for deposits containing very coarse gravel
Is not economical for holes of less than 10 cm
All listed here

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