2. 外语
  3. If s/t=2，then the Value of which of the following can be determined?

If s/t=2，then the Value of which of the following can be determined?

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问题 If s/t=2，then the Value of which of the following can be determined?
选项 A、Ⅰ only
B、Ⅲ only
C、Ⅰ and Ⅱ only
D、Ⅱ and Ⅲ only
E、Ⅰ，Ⅱ，and Ⅲ
答案C
解析 Substitute 2t for s in the expressions given in I, II, and III.
√ I. Value can be determined: 2t/s = 2t/2t = 1
√ II. Value can be determined:

× Ⅲ. Value cannot be determined: equals 0 if t = 1, and equals 1/3 if t = 2
The correct answer is C.
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