An analog signal's characteristic quantity representing data may(66). at any instant, any
An analog signal's characteristic quantity representing data may(66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70) number of well-defined discrete values that one of its characteristic quantities may take in time.
A．acquire
B．collect
C．assume
D．fetch
probably,until,June,won't,any,we,May,or,flowers,s 英语 2020-04-26 …
在等差数列an中,公差为d:若共有2n项,则S2n=n(an+an+1);S偶-S奇=nd;S偶: 数学 2020-05-14 …
英语翻译根据对话内容填入适当的词：[1]A：what's your favorite [ B :M 英语 2020-05-16 …
根据下列用英语的描述,写出对应动物的英文名称!1.A kind of bird that many 其他 2020-05-16 …
对于数列{an}，若an+2-an=d（d是与n无关的常数，n∈N*），则称数列{an}叫做“弱等 数学 2020-06-11 …
当项数为2n时S偶-S奇=ndS奇比S偶=an比an+1(中间项）当项数为2n-1S奇-S偶=an 数学 2020-06-26 …
在等差数列｛an｝中,⑴若项数为偶数2n,则S2n=n(a1+a2n)=n(an+an+1)(an 数学 2020-07-21 …
1.—DoesJimhaveruler?—Yes,hehas.A.an;someB.a;oneC. 英语 2020-07-24 …
an的前n项和为S,已知a1=1,且(an+1)=(n+2)/2*S,求an的通项公式 数学 2020-08-02 …
若数列An：a1,a2…an（n≥2）满足丨ak+1-ak丨=1（k=1,2…,n-1）则称An为E 数学 2020-10-31 …