填空题
发布日期:2021-03-12
在网络中传输着各种信号,其中一部分是我们需要的(例如打电话的语音,上网的数据包等等),而另外一部分是我们不需要的(只能说不是直接需要)它用来专门控制电路的,这一类型的信号我们就称之为信令,信令的传输需要一个信令网。
单元(unit)是岩石谱系单位的基本单位,相当于岩石地层单位中的组,是同源深成侵入岩岩区地质填图中最基本的填图单位。
《美美》是一款社交应用软件,软件大小为4.5MB。
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