If ~$\frac{s}{t}$~=2, then the value of which of the following can be determined?
I ~$\frac{2t}{s}$~
II ~$\frac{s-t}{t}$~
III ~$\frac{t-1}{s-1}$~
I only
III only
I and II only
II and III only
I and II and III
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s = 2t I: 2 !!: 1 III: 不确定
s = 2t
I: 2
!!: 1
III: 不确定