【单选题】The supply and demand of agricultural products are ______ balanced.
【简答题】英译汉But we are not that experienced as you, so we can only offer a general figure.And it seems that the pocket is too low.
【单选题】宽带调相描述正确的是()。
C.
从卡森公式来看调相信号与调频信号的频带宽度仅是用调相指数取代调频指数
D.
调相信号频谱与调频信号频谱各边频分量相移相同
【简答题】词汇翻译(英译汉)to give sb. a general idea of
【单选题】调相的描述是 。
A.
用调制信号去控制载波信号的相位,使载波信号的相位随调制信号的规律而变化
B.
用载波信号去控制调制信号的相位,使载波信号的相位随调制信号的规律而变化
C.
用调制信号去控制载波信号的相位,使调制信号的相位随载波信号的规律而变化
【简答题】(英译汉)If the importer wants to have a general idea of the commodity, he may make a request for a pricelist, a catalogue, samples and other terms.
【单选题】调相信号的功率谱计算描述正确的是()。
A.
调制信号函数对时间的微分的概率密度函数并不总是容易求得
B.
高斯随机信号而言,微分后的概率密度函数仍为高斯分布
C.
当调制信号为任意限带信号时,卡森公式也可以估算出调相信号的频带宽度
【单选题】A comparison and contrast paragraph or essay can be organized by either a block method or a slice method. What method is used in the following paragraph? My hometown and my college town have several ...