Building Construction
The disease of dry rot in timber is caused by

Alternate wet and dry conditions
Complete submergence in water
Lack of ventilation
None of these

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

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

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