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to phrases
reference frequency
agric. 引用频率
auto. 基准参考频率
el., meas.inst. 参比频率
oil 参考频率
piez. 基准频率
space 参照频率
telecom. 参考频率800Hz, 1000Hz, 或 1020Hz; 引用次数
reference frequency: 23 phrases in 8 subjects
Air defense2
Aviation1
Electronics6
Hydroelectric power stations1
Mathematics1
Space6
Technology3
Telecommunications3

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