单项选择题
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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WhichofthefollowingwouldbetheBESTprocessforthetechniciantofollowwhenbeginningtodiagnoseaunitatacustomerssite？（）
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