... 9 - Organic Chemistry有机化学 2 - Signals and Systems or信号和系统或 0 - Introduction to Signals and Systems信号与系统介绍 ...
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signals and systems or
信号及系统或
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Under the Federal Communications Commission's requirement, cable operators must either switch to all-digital systems, or carry both the digital and analog signals of local stations in the first three years after the February 2009 conversion.
WSJ: Cable Must Air Broadcast Signals
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