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【单选题】
已知信号 、 波形如图2所示,设 ,则 为( )。
A.
1
B.
2
C.
3
D.
4
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A.
occasions
B.
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C.
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D.
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A.
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B.
洪灾
C.
旱灾
D.
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A.
正确
B.
错误
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A.
impulse
B.
insanity
C.
inspiration
D.
disposition
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