2. 外语
  3. If Z is represented by the decimal 0. W7, what is the digit W?

If Z is represented by the decimal 0. W7, what is the digit W?

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问题 If Z is represented by the decimal 0. W7, what is the digit W?
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答案B
解析 alone is insufficient because Z could be 0.67, 0.77, 0.87, or 0.97. (2) alone is sufficient, because the only decimal Z that meet the conditions is 0.97.
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