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| Английский тезаурус | |||
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| A numeric value, which has been calculated mathematically, is added to data to ensure that original data have not been altered or that an incorrect, but valid match has occurred. (Check digit control is effective in detecting transposition and transcription errors) | |||
| check: 3 фразы в 1 тематике |
| Майкрософт | 3 |