搜题
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第1题

PC-to-PC networking could be easily accomplished between buildings (). A.on one campus B.between campuses C.a or b D
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第2题

In a ()switching system, a call was established and routed in a set of progressive electromechnical steps, each under th
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第3题

The principle of converting analog signals to digital signals became popular with the introduction of (). A.pulse code
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第4题

() can be regarded as a general-purpose digital network capable of supporting a wide range of services such as voice, da
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