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【单选题】
离散信号f(n)是指()A.
n的取值是连续的，而f（n）的取值是任意的信号。
B.
n的取值是离散的，而f（n）的取值是任意的信号。
C.
n的取值是连续的，而f（n）的取值是连续的信号。
D.
n的取值是离散的，而f（n）的取值是离散的信号。
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举一反三
【单选题】-Did you remember to give Mary the money you owed her? -Yes, I gave it to her ________ I saw her. [ ]
A.
while
B.
the moment
C.
suddenly
D.
once
【单选题】— Did you remember to give Mary the money you owed her? — Yes, I gave it to her ________ I saw her.
A.
constantly
B.
directly
C.
suddenly
D.
supposedly
【简答题】软件需求分析的操作性原则和需求工程的指导性原则是什么？
【单选题】____ I saw her, I remembered to give Marie the money I owed her.
A.
While
B.
Immediately
C.
Suddenly
D.
Momentarily
【单选题】---Did you remember to give Jane the money you owned her? ---Yes, I gave it to her_________ I saw her.
A.
while
B.
the moment
C.
suddenly
D.
once
【简答题】I recognized her____________I saw her. A.the instant (that) B.after C.if not D.unless
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