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单选题
Which of the following is true about job chains?（）
A
They consist of one or more Scheduler programs.
B
They are used to implement dependency scheduling.
C
They are used to implement time-based scheduling.
D
They are used to implement event-based scheduling.
E
None of the above.
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They consist of one or more Scheduler programs.B
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They consist of one or more Scheduler programs.B
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marketing campaignsC
merchandising associationsD
loyalty programs
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