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【简答题】
图所示各电路中,硅二极管导通压降为0.7V,如电源均为3V,输入电压VI分别为+6V,0V,-6V,求各电路的输出电压V O 。 (1) (2) (3)
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【单选题】电子商务中买卖双方的业务活动可以合成为交易前的准备、贸易的磋商、合同的签订以及( )等环节。
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