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铝中杂质含量增加,电阻率

A、不变
B、增大
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正确答案:

B

答案解析:

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IrecentlywroteanautobiographyinwhichIrecalledmanyoldmemories.Oneofthemwasfrommyschooldays,whenourninthgradeteacher,MissRaber,wouldpickoutwordsfromtheReader’sDigesttotestourvocabulary.

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