129.DS:n 是一个小于10的正整数:(1) n is the tenth digit of the decimal notation of 1/n (2) n is the hundredth of the decimal notation of 1/n
我选的是A,(因为符合条件的只有3,而第二个条件中符合的有3和6)
解:A
注意细心,有可能有些人不注意6,会选D
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