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Terms for subject Telecommunications containing first-order | all forms | exact matches only | in specified order only
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first order approximation model第一级近似模型
first order PCM system一次群 PCM 系统
first order theory一阶理论
first-order digital transmission hierarchy一次群数字传输体系1554 kb/s 或 2048kb/s
first-order multiplexed signals经一次复用的信号
first-order multiplexes一次复用

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