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| quarter | |||
| both perpendicular; mutual perpendicular (的); orthogonalization | |||
| orthogonality | |||
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| quarter | |||
| 相互垂直: 13 phrases in 6 subjects |
| Bridge construction | 3 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 3 |
| Oil / petroleum | 2 |
| Technology | 3 |
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