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【简答题】
两个不同频率的周期信号x与y，其互相关函数为 。
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举一反三
【单选题】According to the passage, language has played a very important part in______．
A.
teaching apes a few words
B.
expressing ourselves well
C.
understanding the animals
D.
developing our civilization
【单选题】Which of the following is true according to the text?
A.
The principle of gene therapy is applicable to that of cloning.
B.
The isolation of stem cells is too difficult to be feasible.
C.
It is reasonable for all body instructions to be activated.
D.
Cloned animals will ually take control of the world.
【简答题】ap______ly according to the way sth appears
【单选题】Which of the following is true according to the text?
A.
The principle of gene therapy is applicable to that of cloning.
B.
The isolation of stem ceils is too difficult to be feasible.
C.
It is reasonable for all body instructions to be activated.
D.
Cloned animals will ually take control of the world.
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