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Which practice tested that exception?

  • A.Nothing, since the exception is narrowly defined and has never been the subject of any dispute at all
  • B.Only enrichment
  • C.Reducing exhaust gas recirculation across a broad temperature range on the grounds of protecting the engine
  • D.Thermal windows limiting recirculation over a wide range

Answer: D

Wide thermal windows were justified as protection and challenged as abuse. The last option describes exactly that practice, which makes it a correct and more concrete version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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