试题与答案

自熔性烧结矿和()不能长期贮存。

题型:填空题

题目:

自熔性烧结矿和()不能长期贮存。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:单极性:电脉冲之间无间隔,极性单一,,易于用TTL,CMOS电路产生。双极性:当0,1等概出现时无直流分量,接收端判决电平为零,抗干扰能力强。归零:单极性NR可以提取定时信息。非归零:差分:可以消除...

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