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【单选题】
若一线性移不变系统当输入为 x(n)=δ(n) 时,输出为 y(n)=R 2 (n) ,则当输入为 u(n)-u(n-2) 时,输出为A.
R 2 (n)-R 2 (n-2)
B.
R 2 (n)+R 2 (n-2)
C.
R 2 (n)-R 2 (n-1)
D.
R 2 (n)+R 2 (n-1)
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举一反三
【单选题】What kind of customer does online banking most appeal to?
A.
People who are in the habit of switching from one bank to another.
B.
Young people who are fond of modern technology.
C.
Young people who are wealthy and well-educated.
D.
People who have computers at home.
【单选题】What does the author try to do in the last paragraph?
A.
Appeal for donations.
B.
Make an advertisement.
C.
Promote training programs.
D.
Show sympathy for the blind.
【单选题】What kind of customers does online banking most appeal to?
A.
People who are in the habit of switching from one bank to another.
B.
Young people who are fond of modern technology.
C.
Young people who are wealthy and well-educated.
D.
People who have computers at home.
【单选题】What kind of customer does online banking most appeal to?
A.
People who are in the habit of switching from one bank to another.
B.
Young people who are fond of modem technology.
C.
Young people who are wealthy and well-educated.
D.
People who have computers at home.
【单选题】.For what purpose does Fred Nawusky appeal for more funding?
A.
To set up more language schools.
B.
To document enda ngered languages.
C.
To educate native American children.
D.
To revitalise America's native languages.
【单选题】What does Kennedy appeal his countrymen to do to support him?
A.
To take up arms and to fight in the battlefield
B.
Not to ask what the country can do for them but what they can do for their country
C.
To admire other generations and exchange position with them
D.
To finish all the goals as soon as possible
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