For the pile group shown in the figure, the efficiency of the pile group determine by Feld’s rule is\(\begin{array}{*{20}{c}}0&{}&0\\{}&0&{}\\0&{}&0\end{array}\)

For the pile group shown in the figure, the efficiency of the pile gro

1.	For the pile group shown in the figure, the efficiency of the pile group determine by Feld’s rule is\(\begin{array}{*{20}{c}}0&{}&0\\{}&0&{}\\0&{}&0\end{array}\)
A.	80%
B.	85%
C.	88%
D.	90%
Answer» B. 85%

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For the pile group shown in the figure, the efficiency of the pile group determine by Feld’s rule is\(\begin{array}{*{20}{c}}0&{}&0\\{}&0&{}\\0&{}&0\end{array}\)

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