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【简答题】
数据库有哪些类型?
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B.
herself
C.
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D.
she
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A.
preventing
B.
pretending
C.
permitting
D.
persuading
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【简答题】She kept looking behind to see if she was being followed A her B．herself C．her own D．she
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A.
has gone; gone
B.
has been; been
C.
has gone; been
D.
has been; gone
【简答题】无限长单位冲激响应( IIR )滤波器的基本结构有直接型,级联型和 ____________ 三种。
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