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【判断题】
若线性时不变系统是有因果性,则该系统的单位采样响应序列 应满足的充分必要条件是 , 。A.
正确
B.
错误
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举一反三
【单选题】With pressure from life and work increasing day by day, there should be something for people to ______. [ ]
A.
make fun of
B.
have fun with
C.
play tricks on
D.
have for fun
【单选题】The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.
who
B.
when
C.
on which
D.
which
【单选题】We can infer from the passage that Jean-Marc Rapp
A.
gave full support to the Bologna process in 1999.
B.
gave credit to the European countries that joined Bologna in 1999.
C.
did not have much faith in the Bologna process at first.
D.
intended to make Bologna an inter-governmental treaty.
【单选题】The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.
who
B.
when
C.
on which
D.
Which
【简答题】The weather ______ (vary) from day to day.
【单选题】A place is moved from day into night and from night into day over and over by ______ of the earth.
A.
the pushing
B.
the pulling
C.
the spinning
D.
the passing
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