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【单选题】
已知信号f1(t)如下图所示,其表是( )A.
mg src="http://p.ananas.chaoxing.com/star3/origin/54d7ed096e8a01075bf3b997adee0b48.jpg">
B.
Ɛ(t)+2Ɛ(t-2)-Ɛ(t-3)
C.
Ɛ(t-1)+Ɛ(t-2)-2Ɛ(t-3)
D.
Ɛ(t)+Ɛ(t-2)-Ɛ(t-3)
E.
Ɛ(t-1)+Ɛ(t-2)-Ɛ(t-3)
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A.
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A.
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B.
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