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【单选题】
在CSS背景属性中,background-image属性的作用是( )。A.
设置元素的背景颜色
B.
把图像设置为背景
C.
设置背景图像的起始位置
D.
设置背景图像是否及如何重复
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举一反三
【单选题】The Japanese guests suggested ____ their country.
A.
our visiting
B.
to us a visit to
C.
we pay a visit to
D.
all the above
【简答题】已知某离散线性时不变系统的差分方程为2y(n)-3y(n-1)+y(n-2)=x(n-1)，且x(n)=2 n u(n)，y(0)=1，y(1)=1，求n≥0时的输出y(n)。
【单选题】Our teacher recommended that we ______ as attentive as possible when we visit the chapel.
A.
are
B.
shall be
C.
be
D.
were
【单选题】Since our stay was too short,we couldn't visit all the places ________.
A.
where we should like to visit
B.
which we would like to visit them
C.
where we should have liked to
D.
which we would have liked to
【单选题】We____the Expo Park in Shanghai this summer vacation. [ ]
A.
visit
B.
visited
C.
will visit
D.
have visited
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