单选题Scheduled preventative maintenance visits should be carried out：（）Aafter two unplanned service calls.Baccording to manufacturers specifications.Cwhen the device is becoming unreliable.Devery sixty days.
单选题
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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