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【多选题】
以下对FIR和IIR滤波器特性的论述中错误的是（）。A.
FIR 滤波器主要采用非递归结构
B.
FIR 滤波器总是稳定的
C.
IIR 滤波器也可以做到线性相位
D.
实现相同滤波器性能指标， FIR 所需的阶数通常比 IIR 更小
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举一反三
【简答题】喜鹊：梅花
【单选题】That design of a magpie on a plum tree branch __________ luck and happiness. [ ]
A.
brings about
B.
takes in
C.
brings in
D.
stands for
【单选题】Magpie(喜鹊) represents "Good luck" in China, and "wordiness" in Britain, which shows the difference in ( ) meaning, namely the overtones or associations which a word suggests or implies.
A.
Affective;
B.
Stylistic;
C.
Connotative;
D.
collocative
【单选题】Magpie (喜鹊) has different images in different cultures, because it has different _____________.
A.
denotation (所指涵义)
B.
connotation (内涵意义)
C.
cultural connotation (文化内涵意义)
D.
meaning
【简答题】magpie
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