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When a supercritical stream enters a mild-sloped $(\mathrm{M})$ channel section, the type of flow profile would become _________.

  1. $\mathrm{M}_{1}$
  2. $\mathrm{M}_{2}$ 
  3. $\mathrm{M}_{3}$
  4. $\mathrm{M}_{1}$ and $\mathrm{M}_{2}$ 
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