1.

What is the correct Douma’s equation for rectangular tunnels or conduits?

A. X² + 10.4 Y² = d²
B. 4X² + 10.4 Y² = d²
C. 4X² + 44.4 Y² = d²
D. X² – 10.4 Y² = d²
Answer» B. 4X² + 10.4 Y² = d²


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