【单选题】【消耗次数：1】
A: Why didnt you come to my party last night? B: Im sorry, [填空]. I had to visit my grandmother at the hospital.
①
I did it
②
I still remember it
③
I will come
④
I couldnt make it
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用数据选择器实现n变量逻辑函数时，下列说法正确的有（）。
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用数选，其数据非0即1，无需其它门电路
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用数选，其数据非0即1，无需其它门电路
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下列关于最小项的说法中，正确的有（）。
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全体最小项相或的结果为0。
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