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【单选题】
已知A1键的动频率是27.5Hz,求A25键的振动频率()A.
27.5Hz
B.
55Hz
C.
110Hz
D.
220Hz
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A.
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B.
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C.
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D.
that; what
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【简答题】下图所示昆虫属于()目()科。
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A.
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【单选题】It is said that the ______ of some of the state-owned companies can't meet their expenditure.
A.
credits
B.
revenues
C.
deficits
D.
taxes
【简答题】下图所示昆虫属于()目()科。
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