frequency-density是什么意思
题目
frequency-density是什么意思
答案
1.Their instruments detected very faint radiowaves at a frequency of 3 kilohertz.(26.5K)
他们的仪器检测到一个3千赫的微弱无线电波.
2.Fatal road accidents have decreased in frequency over recent years.
近年来致命交通事故发生率已经下降.
3.If we can know their frequency we will monitor their talking.
如果我们知道他们的频率,我们就能监听他们的谈话.
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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