In the method of tube boring of soil investigation, the following is e

1.	In the method of tube boring of soil investigation, the following is essential :
A.	a tube of about 2 metres length and 20 cm diameter with a cutting edge
B.	a flap valve at the bottom of tube is provided to extract the soil sample
C.	the tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
D.	all the above.
Answer» E.

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

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