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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 | |