Vocabulary. Complete the following sentences with the proper forms of the given words. There is usually a postage and packing fee in________to the repair charge.(add)
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举一反三
【简答题】阅读下面的Python语句,请问输出结果是什么? numbers={} numbers[(1,2,3)]=1 numbers[(2,1)]=2 numbers[(1,2)]=3 sum=0 for k in numbers: sum+=numbers[k] print(len(numbers),sum,numbers)