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clocking frequency; elementary frequency | |||
reference frequency | |||
frequency reference | |||
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reference frequency |
基准 频率: 26 phrases in 9 subjects |
Air defense | 4 |
Aviation | 1 |
Business | 1 |
Electric machinery | 1 |
Electronics | 5 |
Mathematics | 1 |
Space | 6 |
Technology | 6 |
Telecommunications | 1 |