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standard frequency and time signals
earth.sc.
标准频率和计时信号
;
标频时号
el.
标准频率与时间信号
standard frequency and time signal
avia.
标准频率和时间信号
tech.
校准频率和时间信号
;
标频时号
standard frequency and time signals
:
5 phrases
in 3 subjects
Space
1
Technology
3
Telecommunications
1
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