Scheduled preventative maintenance visits should be carried out：（）A、after two unplanned service calls.B、according to manufacturers specifications.C、when the device is becoming unreliable.D、every sixty days.
Scheduled preventative maintenance visits should be carried out：（）
- A、after two unplanned service calls.
- B、according to manufacturers specifications.
- C、when the device is becoming unreliable.
- D、every sixty days.
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