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【判断题】
已知某离散系统的差分方程为[mathjaxinline]2y(n+2)-3y(n+1)+y(n)=x(n+1)[/mathjaxinline]，其初始状态为[mathjaxinline]y_{zi}(-1)=-2,y_{zi}(-2)=-6[/mathjaxinline]，激励[mathjaxinline]x(n)=u(n)[/mathjaxinline]，则该系统是临界稳定的。A.
正确
B.
错误
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【单选题】During the early stages of the civil rights movement, the major integration strategy initiated by the Congress of Racial Equality was known as ____ at bus stations in the South.
A.
Free speech
B.
sit-ins at lunch counters
C.
Teach-ins at interstate train stations
D.
rides
【单选题】A rabid animal is most erous during the early stage of the disease because______.
A.
it becomes restless, nervous and violent
B.
its bite is fatal
C.
the potential er of the sick animal may be ignored
D.
it will attack people at any time
【简答题】Early Modem English was recognizable to the Early Modem speaker during the period of the 15th century to the 17th century, although at that time the word order and______was still slightly different.
【简答题】沉积岩的形成过程一般分为风化破坏作用、搬运作用、 和 四个阶段。
【单选题】Mr. Anderson used to (jogging) in the (early morning) air (during) (the winter months), but now he has stopped.
A.
jogging
B.
early morning
C.
during
D.
the winter months
【单选题】What was the role of religion at Harvard University during its early years?
A.
It was not influenced by any religion.
B.
It was heavily influenced by one religious group.
C.
It was not dominated by a single religious group.
D.
It was devoted only to religion.
【单选题】(During) the early stages of the industrial revolution, perhaps (one in every seven) (deaths) in Europe' s (crowded cities) was caused by tuberculosis.
A.
During
B.
one in every seven
C.
deaths
D.
crowded cities
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