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Which durability requirement applies to emissions equipment?

  • A.A requirement that the control systems remain effective for a specified mileage or number of years in service
  • B.Compliance for a defined distance or period
  • C.None, since the equipment need only function at the moment the vehicle is tested for its approval
  • D.Nothing

Answer: B

Durability requirements bind the performance for a defined life. The last option states that requirement precisely, which makes it a correct and more accurate version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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