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| поле с нулевым значением; поле со значением Null (" A field containing a Null value. A null field isn't the same as a field that contains a zero-length string (" ") or a field with a value of 0.") | |||
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| полностью компенсированное поле | |||
| null field: 2 phrases in 2 subjects |
| Antennas and waveguides | 1 |
| Mass media | 1 |