Discussion
Consider the following statements about maintaining a viewing cabinet.
1. Lamp hours are recorded and lamps replaced on schedule.
2. The interior surfaces must remain a specified neutral grey.
3. Lamps need replacing only when they fail to light at all.
Answer: C
The first two are correct and are standard maintenance practice. The third would allow the assessment condition to drift far outside specification long before failure. Scheduled replacement is the only reliable method.
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