Building Construction
Pick up the correct specification of one-room quarters generally adopted from the following:

Six quarters in a row
The size of room is either 3.5 m × 3 m or 4.2 m × 2.5 m
All listed here
The front verandah is kept 2 m wide

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Building Construction
Rotary drilling

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

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