Building Construction
During percussion drilling

All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
The soil to a considerable depth below the bottom of the hole gets disturbed
Caving or mixing of strata are caused in soft soils or cohesion-less soils

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Building Construction
In English garden wall bond

Queen closer in provided in each heading course
One course of headers to three or five course of stretchers
All of these
The middle course of stretchers is started with a header to give proper vertical joints

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