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二极管是用一个PN结制成的半导体器材,它的最基本的性质是( ),硅管的死区电压和正向压降比锗管的( ),而反向饱和电流比锗管的( )得多。
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【单选题】下列各项中不属于管理会计的职能作用的是()。
A.
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B.
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C.
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D.
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