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Which of the following factors can influence service life expectancy of components and systems?
  1. Installation
  2. Maintenance
  3. Materials
  4. All of the above
Explanation
Answer: D - All of the above factors can influence service life expectancy of components and systems. Components installed improperly will wear down faster. Owners who keep up with maintenance schedules of components and systems find elements last longer. High quality materials can also extend the service life of components and systems.
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