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【简答题】
假设输入信道的加性噪声功率为N(W)，信道的带宽为B(Hz)，信号功率为S(W)，则连续信道容量的公式为_____________
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举一反三
【单选题】There are some social problems in the United States. And drug abuse has come to be 【21】______ as one of the most challenging social problems facing the nation. Indeed, the very word' drug' excites str...
A.
regarded
B.
respected
C.
referred
D.
treated
【单选题】For years the strategy against drug ______.
A.
hasn't worked as desired
B.
has encouraged the supply of drug
C.
hasn't cut off the networks that distribute drug
D.
has cracked clown on drug consumers
【单选题】Anti-drug work has become a ______ of attention among the international community with the spread of drug abuse in the world.
A.
spot
B.
center
C.
zoom
D.
focus
【简答题】For most drug users, their ______ has something to do with theist psychological addiction.
【简答题】Consumer mistrust has led to ______ about drug safety and risks.
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