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| Machtal | |||
| Angielski tezaurus | |||
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| The ratio of the speed of an object to the local speed of sound | |||
| M | |||
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| 4 digit number identifying PSDS input device (MODS report abbreviation) | |||
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Mach number : 11 do fraz, 3 tematyki |
| Nauk fizycznych | 2 |
| Nauka o ziemi | 6 |
| Transport | 3 |