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time reference | |||
time keeper | |||
time standard | |||
timing reference | |||
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time standard |
эталон времени: 25 phrases in 10 subjects |
Astronautics | 2 |
Computers | 1 |
Household appliances | 2 |
Makarov | 1 |
Mass media | 1 |
Metrology | 7 |
Military | 2 |
Quantum electronics | 1 |
Technology | 7 |
Telecommunications | 1 |