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Computer Science Fundamentals System Design Objective
Apr 07, 2013

During percussion drilling

Choose the correct answer:
A) ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
B) caving or mixing of strata are caused in soft soils or cohesionless soils
C) the soil to a considerable depth below the bottom of the hole gets disturbed
D) All of these
Detailed Explanation

Option d is right answer.

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