And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.

根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。

youdao

So to talk about a 3.47 V signal really means nothing unless we know with respect to what reference.

因此我们所说的一个3.47V信号其实并没有什么意义，除非指出其参照物。

youdao

So to talk about a 3.47 V signal really means nothing unless we know with respect to what reference.

因此我们所说的一个3.47V信号其实并没有什么意义，除非指出其参照物。

youdao