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| horizontal at the muzzle; horizontal plane through the gun; level point (The level point is the point on the descending branch that is the same altitude as the origin (FM 6-40) tannin) | |||
| zero plane | |||
| горизонт орудия: 4 phrases in 3 subjects |
| Artillery | 2 |
| Military | 1 |
| Technology | 1 |