In economical digging, sectional area of excavation is _______ sectional area of banking.

In economical digging, sectional area of excavation is _______ section

1.	In economical digging, sectional area of excavation is _______ sectional area of banking.
A.	equal to
B.	less than
C.	greater than
D.	None of the above
Answer» B. less than

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In economical digging, sectional area of excavation is _______ sectional area of banking.

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