单选题When is it advisable to dump the waste toner from a technicians service vacuum？（）AWhen it is full.BIt is not recommended.CBefore performing preventative maintenance.DAfter each call.
单选题
When is it advisable to dump the waste toner from a technicians service vacuum？（）
A
When it is full.
B
It is not recommended.
C
Before performing preventative maintenance.
D
After each call.
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